Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

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Stockholders' Equity - Additional Information (Detail)
1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended
Oct. 12, 2016
USD ($)
$ / shares
shares
May 13, 2016
USD ($)
$ / shares
shares
Jul. 26, 2017
USD ($)
Jan. 25, 2017
$ / shares
shares
Jul. 21, 2016
USD ($)
$ / shares
shares
May 31, 2016
USD ($)
May 16, 2016
USD ($)
$ / shares
shares
Jan. 21, 2016
USD ($)
$ / shares
shares
Oct. 31, 2016
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Oct. 31, 2016
USD ($)
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
Mar. 08, 2017
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Class of Stock [Line Items]                              
Common Stock, Shares Authorized | shares                   100,000,000   100,000,000     100,000,000
Preferred Stock, Shares Authorized | shares                   10,000,000   10,000,000     10,000,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares               1,416,668              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares               $ 1.79              
Preferred Stock, Par or Stated Value Per Share | $ / shares                   $ 0.001   $ 0.001     $ 0.001
Proceeds from Issuance of Common Stock                       $ 0 $ 1,182,278    
Payments for Repurchase of Preferred Stock and Preference Stock                       0 $ 2,500,000    
Conversion Price Per Share | $ / shares               $ 1.50              
Percentage of Investors Subscription Amount               85.00%              
Commission Of Placement Agent, Percentage               10.00%              
Commission Of Placement Agent, Value               $ 250,000              
Preferred Stock, Redemption Terms         Following subsequent amendments to the Series E Purchase Agreement, the Series E Preferred Stock is redeemable at the option of the Company at 170% of the then outstanding conversion amount, and is convertible into common stock at a conversion price equal to the lesser of (a) $2.005 per share, or (b) 65% of the volume weighted average price of our common stock for ten consecutive days prior to the applicable conversion date). The Series E Purchase Agreement required the Company to hold a special meeting of stockholders to seek the approval of the holders of its common stock for the issuance of the number of shares of common stock issuable upon the conversion of the Series E Preferred Stock in excess of 19.99% of the outstanding common stock within 120 days of the execution of the Series E Purchase Agreement. The Company obtained the requisite shareholder approval on March 8, 2017.                    
Common Stock, Value, Issued                   $ 18,608   18,608     $ 11,532
Exchange Right And Leak Out Agreement [Member]                              
Class of Stock [Line Items]                              
Common Stock, Value, Issued     $ 1,350                        
Description Of Exchange Agreement, Terms Of Agreement     The holders also agreed to not sell the Exchange Shares in an amount that would exceed the greater of (a) a percentage of the total trading volume on any given day and (b) $500, with an aggregate limit of 25% of total trading volume among all holders. Any sale of Exchange Shares at a price of more than $0.20 per share (the “Break-out Price”) is not subject to the agreement. The Break-out Price may be further reduced if the Company does not meet certain requirements under the agreement.                        
Purchase Agreement 2016 [Member]                              
Class of Stock [Line Items]                              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares             $ 2.005                
Percentage Of Common Stock Purchased By Each Purchaser             100.00%                
Series D Purchase Agreement [Member]                              
Class of Stock [Line Items]                              
Stock Issued During Period, Shares, New Issues | shares   369                          
Proceeds from Contributions from Affiliates   $ 144,000                          
Chardan Capital Markets [Member]                              
Class of Stock [Line Items]                              
Cash Paid To Placement Agent           $ 116,932                  
Investor [Member]                              
Class of Stock [Line Items]                              
Legal Fees                       50,000      
Payments for Underwriting Expense                       $ 25,000      
Purchase Agreement [Member]                              
Class of Stock [Line Items]                              
Sale of Stock, Price Per Share | $ / shares             $ 2.005                
Proceeds from Issuance of Common Stock             $ 1,300,000                
Stock Issued During Period, Shares, New Issues | shares             648,000                
Public Offering [Member]                              
Class of Stock [Line Items]                              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 6,000,000                            
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 1.00                            
Proceeds from Issuance or Sale of Equity $ 6,000,000                            
Shares Issued, Price Per Share | $ / shares $ 1.00                            
Sale of Stock, Number of Shares Issued in Transaction | shares 6,000,000                            
Proceeds from Issuance Initial Public Offering $ 5,100,000                            
Payments for Repurchase of Preferred Stock and Preference Stock 1,300,000                            
Payments for Operating Activities $ 3,800,000                            
Percentage Of Increase In Preferred Stock Redemption Premium 15.00%                            
July 2016 Warrants [Member]                              
Class of Stock [Line Items]                              
Reduction In Exercise Price Of Warrants | $ / shares $ 1.43                            
May 2016 Warrants [Member]                              
Class of Stock [Line Items]                              
Reduction In Exercise Price Of Warrants | $ / shares $ 1.86                            
Series C Convertible Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Proceeds from Issuance Initial Public Offering $ 3,800,000                            
Series E Convertible Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares       1,000,000                      
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 0.60                      
Preferred Stock Dividends, Income Statement Impact               $ 466,667              
Stock Redeemed or Called During Period, Value                     $ 2,474        
Stock Redeemed or Called During Period, Shares | shares                     3,837,400        
Preferred Stock Redemption Premium                     $ 1,363,400        
Class Of Warrant Or Rights Expiration Term       5 years 6 months                      
Preferred Stock, Participation Rights     Pursuant to the agreement, in lieu of the conversion right as provided in the Certificate of Designation of Preferences, Rights and Limitations of the Series E Preferred Stock, each holder has the right to exchange its shares (the “Shares”) of Series E Preferred Stock for shares (the “Exchange Shares”) of the Company’s common stock at an exchange rate so that for each Share, the holder will receive a number of Exchange Shares that would yield net proceeds of $1,350 upon resale of such Exchange Share. Additionally, the holders consented to any Company non-equity linked financing or financing of its interest in INVT SPE subject to certain limitations as provided in the agreement. The holders also agreed to not sell the Exchange Shares in an amount that would exceed the greater of (a) a percentage of the total trading volume on any given day and (b) $500, with an aggregate limit of 25% of total trading volume among all holders. Any sale of Exchange Shares at a price of more than $0.20 per share (the “Break-out Price”) is not subject to the agreement. The Break-out Price may be further reduced if the Company does not meet certain requirements under the agreement.                        
Series C Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Conversion of Stock, Description   common stock issuable upon the conversion of the Series C Preferred Stock in excess of 19.99% of the outstanding common stock and the removal of the adjustment floor within 120 days of the execution of the Series C Purchase Agreement. The Company obtained the requisite shareholder approval on June 28, 2016. Additionally, until the Series C Preferred Stock is no longer outstanding, the Series C Investors may participate in future offerings for up to 50% of the amount of such offerings.                          
Series C Preferred Stock [Member] | Private Placement [Member]                              
Class of Stock [Line Items]                              
Preferred Stock, Par or Stated Value Per Share | $ / shares               $ 1,000              
Conversion of Stock, Shares Converted | shares               1,666,668 21            
Stock Issued During Period, Shares, New Issues | shares               2,500              
Stock Issued During Period, Value, New Issues               $ 2,500,000              
Conversion Price Per Share | $ / shares               $ 1.50              
Series E Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Preferred Stock, Par or Stated Value Per Share | $ / shares         $ 1,000                    
Debt Instrument, Convertible, Conversion Price | $ / shares                           $ 0.50  
Conversion of Stock, Shares Converted | shares         1,496,262         182          
Proceeds from Issuance Initial Public Offering         $ 3,000,000                    
Stock Issued During Period, Value, New Issues         $ 3,000,000                    
Conversion Price Per Share | $ / shares         $ 2.005                    
Preferred Stock, Redemption Terms                       The Company used part of the proceeds from the sale of Series E Preferred Stock to redeem 70% of the outstanding Series C Preferred Stock. In addition, pursuant to the terms of the Series E Purchase Agreement, each of the Series C Investors was entitled to receive an additional premium such that the aggregate redemption amount is 162% of the stated value of the Series C Preferred Stock for the first 60 days after the date of the Series E Purchase Agreement and 180% thereafter.      
Common Stock Dividends, Shares | shares                   3,470,762          
Series E Preferred Stock [Member] | Private Placement [Member]                              
Class of Stock [Line Items]                              
Stock Issued During Period, Shares, New Issues | shares         3,000                    
Series D Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 1.87                          
Percentage of Investors Subscription Amount   85.00%                          
Preferred Stock Convertible Conversion Price   1.98                          
Preferred Stock, Redemption Terms   The Company may redeem some or all of the Series D Preferred Stock for cash in an amount equal to 135% of the aggregate stated value then outstanding.                          
Series D Preferred Stock [Member] | Purchase Agreement [Member]                              
Class of Stock [Line Items]                              
Proceeds from Issuance of Convertible Preferred Stock   $ 369,000                          
Sale of Stock, Price Per Share | $ / shares   $ 1,000                          
Maximum [Member]                              
Class of Stock [Line Items]                              
Common Stock, Shares Authorized | shares                   110,000,000   110,000,000      
Maximum [Member] | Series E Convertible Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Preferred Stock Redemption Price Percentage       165.00%                      
Minimum [Member] | Series E Convertible Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Preferred Stock Redemption Price Percentage       170.00%