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%