Equity Transactions - Additional Information (Detail)					3 Months Ended				6 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	Jun. 30, 2017 USD ($) $ / shares	Mar. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares	Sep. 30, 2016 USD ($) $ / shares	Jun. 30, 2017 USD ($) $ / shares	Sep. 30, 2017 USD ($) Triggering_Event $ / shares shares	Sep. 30, 2016 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares	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
ASU 2017-11 [Member]
Class Of Stock [Line Items]
Increase (decrease) the Loss before provision for income taxes and Net loss					$ (600,000)	$ 600,000	$ 500,000	$ 300,000		$ 0	$ 300,000	$ 800,000
Increased (decreased) net loss					$ (600,000)	$ 600,000	$ 500,000	$ 300,000		$ 0	$ 300,000	$ 800,000
Increase (decrease) the net loss per share | $ / shares					$ (0.05)	$ 0.05	$ 0.04	$ 0.03	$ 0.00	$ 0	$ 0.02	$ 0.07
Reduction of amortization of debt discounts									$ (100,000)			$ (100,000)
ASU 2017-11 [Member] | Previously Reported [Member]
Class Of Stock [Line Items]
Elimination of previously reported change in fair value of warrant liabilities						$ 700,000			$ 100,000		$ 300,000	$ 900,000
Warrants [Member]
Class Of Stock [Line Items]
Triggering event charges										$ 3,000,000
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
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
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
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] | William W. and Dieva L. Smith [Member]
Class Of Stock [Line Items]
Preferred stock, shares converted into common stock | shares	2,750
Series B Preferred Stock [Member] | Andrew Arno [Member]
Class Of Stock [Line Items]
Preferred stock, shares converted into common stock | shares	50
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] | William W. and Dieva L. Smith [Member]
Class Of Stock [Line Items]
Debt instrument, principal amount	2,800,000
Offering [Member] | Andrew Arno [Member]
Class Of Stock [Line Items]
Debt instrument, principal amount	$ 100,000
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
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
Common stock offering price per share | $ / shares													$ 1.05