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Equity Transactions - Additional Information (Detail) |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 29, 2017 USD ($) $ / shares shares | May 17, 2017 USD ($) | May 16, 2017 Investor $ / shares shares | Sep. 02, 2016 $ / shares shares | Sep. 30, 2017 USD ($) Triggering_Event $ / shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2017 USD ($) Triggering_Event $ / shares shares | Sep. 30, 2016 USD ($) $ / shares | Dec. 31, 2016 USD ($) | May 31, 2017 $ / shares
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, issued and sold to investors, purchase price | $ 5,500,000 |  |  |  |  |  | $ 2,413,000 |  |  |
Gross proceeds from issuance of preferred stock | 2,700,000 |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | $ 2,800,000 |  |  |  |  |  |  |  |  |
Warrants term |  |  |  |  |  |  | 5 years |  |  |
Warrants exercisable beginning date |  |  |  |  |  |  | Nov. 18, 2017 |  |  |
Gross proceeds before deducting transaction fees and other expenses |  | $ 2,300,000 |  |  |  |  |  |  |  |
Offering cost related to the transaction |  | 200,000 |  |  |  |  |  |  |  |
Transaction fees |  | 100,000 |  |  |  |  |  |  |  |
Legal and other expenses |  | 100,000 |  |  |  |  |  |  |  |
Cash from issuance of common stock, net of offering costs |  | $ 2,100,000 |  |  |  |  | $ 2,056,000 |  |  |
Number of triggering events for issuance of warrants | Triggering_Event |  |  |  |  | 5 |  | 5 |  |  |
ASU 2017-11 [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Reclassification of warrant liability to additional paid in capital |  |  |  |  | $ 1,800,000 |  |  |  | $ 1,200,000 |
Change in valuation of notes payable to additional paid-in capital |  |  |  |  | $ 700,000 |  |  |  | 700,000 |
Change in fair value of warrant liability |  |  |  |  |  |  |  |  | $ 900,000 |
Increase the Loss before provision for income taxes and Net loss |  |  |  |  |  | $ 300,000 | $ 0 | $ 300,000 |  |
Increased net loss |  |  |  |  |  | $ 300,000 | $ 0 | $ 300,000 |  |
Increase the net loss per share | $ / shares |  |  |  |  |  | $ 0.03 | $ 0 | $ 0.02 |  |
ASU 2017-11 [Member] | Previously Reported [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Elimination of previously reported change in fair value of warrant liabilities |  |  |  |  |  |  |  | $ 300,000 |  |
Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Triggering event charges |  |  |  |  |  |  | $ 3,000,000 |  |  |
Unterberg Koller Capital Fund L.P. and William W. and Dieva L. Smith [Member] | Note and Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock exercise price | $ / shares |  |  |  | $ 2.74 |  |  |  |  |  |
Purchase of warrants | shares |  |  |  | 1,700,000 |  |  |  |  |  |
Warrants expiration period |  |  |  | 5 years |  |  |  |  |  |
Unterberg Koller Capital Fund L.P. [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Adjusted exercise price | $ / shares |  |  |  |  |  |  | $ 2.14 |  |  |
William W. and Dieva L. Smith [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Adjusted exercise price | $ / shares |  |  |  |  |  |  | $ 2.38 |  |  |
William W. and Dieva L. Smith [Member] | Note and Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock exercise price | $ / shares |  |  |  | $ 2.74 |  |  |  |  |  |
Purchase of warrants | shares |  |  |  | 850,000 |  |  |  |  |  |
Warrants expiration period |  |  |  | 5 years |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, issued and sold to investors | shares |  |  |  |  |  |  | 3,000 |  |  |
Preferred stock, dividend rate | 10.00% |  |  |  |  |  |  |  |  |
Preferred stock, conversion price per share | $ / shares | $ 1.14 |  |  |  | $ 1.14 |  | $ 1.14 |  |  |
Convertible preferred stock, terms of conversion |  |  |  |  |  |  | In the event that the trading price of the Company’s Common Stock for 20 consecutive trading days (as determined in the Certificate of Designation) exceeds 400% of the then effective Conversion Price of the Series B Preferred Stock (initially set at $1.14), the Company may force conversion of the Series B Preferred Stock into shares of Common Stock or elect to redeem the Series B Preferred Stock for cash. |  |  |
Preferred stock threshold consecutive trading days | 20 days |  |  |  |  |  |  |  |  |
Trading price of common stock exceeds conversion price, percentage | 400.00% |  |  |  |  |  |  |  |  |
Convertible preferred stock, right to increase in dividend percentage upon stock price trigger | 12.00% |  |  |  |  |  |  |  |  |
Triggering event charges |  |  |  |  |  |  | $ 41,000,000 |  |  |
Series B Preferred Stock [Member] | Andrew Arno [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares converted into common stock | shares | 50 |  |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] | William W. and Dieva L. Smith [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares converted into common stock | shares | 2,750 |  |  |  |  |  |  |  |  |
Offering [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of preferred stock | $ 2,700,000 |  |  |  |  |  |  |  |  |
Net proceeds from issuance of preferred stock | 2,500,000 |  |  |  |  |  |  |  |  |
Offering [Member] | Andrew Arno [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | 100,000 |  |  |  |  |  |  |  |  |
Offering [Member] | William W. and Dieva L. Smith [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | $ 2,800,000 |  |  |  |  |  |  |  |  |
Offering [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, issued and sold to investors | shares | 5,500 |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate | 10.00% |  |  |  |  |  |  |  |  |
Preferred stock, price per share | $ / shares | $ 1,000 |  |  |  |  |  |  |  |  |
Preferred stock, issued and sold to investors, purchase price | $ 5,500,000 |  |  |  |  |  |  |  |  |
Preferred stock, conversion price per share | $ / shares | $ 1.14 |  |  |  |  |  |  |  |  |
Preferred stock, shares converted into common stock | shares | 4,824,562 |  |  |  |  |  |  |  |  |
Preferred stock, dividend payment terms |  |  |  |  |  |  | The holders of Series B Preferred Stock are entitled to receive cumulative dividends out of funds legally available thereof at a rate of ten percent (10%) per annum, payable (i) when and as declared by the Board of Directors, in quarterly installments on March 1, June 1, September 1 and December 1, and (ii) upon conversion into Common Stock with respect the Series B Preferred Stock being converted. |  |  |
Registered Direct Offering [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, issued and sold to investors | shares |  |  | 2,077,000 |  |  |  |  |  |  |
Common stock, price per share | $ / shares |  |  | $ 1.05 |  |  |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, issued and sold to investors | shares |  |  | 85,000 |  |  |  |  |  |  |
Common stock, price per share | $ / shares |  |  | $ 1.10 |  |  |  |  |  |  |
Number of accredited investors | Investor |  |  | 4 |  |  |  |  |  |  |
Private Placement [Member] | Andrew Arno [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, issued and sold to investors | shares |  |  | 50,000 |  |  |  |  |  |  |
Common stock, price per share | $ / shares |  |  | $ 1.10 |  |  |  |  |  |  |
Sutter [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of warrants to purchase shares of common stock on number of shares sold |  |  |  |  |  |  | 5.00% |  |  |
Common stock exercise price | $ / shares |  |  |  |  | 1.21 |  | $ 1.21 |  |  |
Common stock offering price per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 1.10
Chardan [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of warrants to purchase shares of common stock on number of shares sold |  |  |  |  |  |  | 5.00% |  |  |
Common stock exercise price | $ / shares |  |  |  |  | $ 1.155 |  | $ 1.155 |  |  |
Common stock offering price per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 1.05

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