Debt Instruments - Additional Information (Detail) - USD ($)	1 Months Ended			12 Months Ended
	Aug. 31, 2016	Aug. 25, 2016	Dec. 23, 2014	Dec. 31, 2016	Dec. 31, 2015	Aug. 09, 2013
Debt Instrument [Line Items]
Interest Paid				$ 429,267	$ 467,500
Lender Warrant 2016 [Member]
Debt Instrument [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				5,169,577
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 0.0994
Intrinsic Value Of Warrants		$ 504,000
Class Of Warrant Or Rights Warrant Term				10 years
Venture Loan [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt			$ 5,000,000
Debt Instrument, Payment Terms			The loan was to be repaid in forty-five (45) monthly payments consisting of fifteen (15) monthly payments of only interest followed by thirty (30) equal monthly payments of principal and interest. In addition, at the end of the repayment term (or at early termination of the loan) a final payment equal to 4.5% of the loan would have been due and payable.
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			2,492,523
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 0.1003
Warrants Expire Term			10 years
Interest Expense, Debt		89,000
Intrinsic Value Of Warrants		$ 261,000
Interest Expense, Other				$ 325,000
Debt Instrument, Unamortized Discount				579,000
Interest Paid				429,000	456,000
Paid-in-Kind Interest				294,000	153,000
Venture Loan [Member] | Lender Warrant 2016 [Member]
Debt Instrument [Line Items]
Interest Paid				$ 429,000	$ 456,000
Debt Restructuring 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis				one month LIBOR Rate exceeds 0.50%
Debt Instrument, Interest Rate, Stated Percentage		11.00%		11.27%	11.27%
Interest Expense, Debt		$ 30,000
Debt Principal Amount Reduced Percentage		33.00%		33.00%		33.00%
Payments for Other Fees	$ 25,000
Legal Fees	$ 5,000
Horizon Technology Finance Corporation [Member] | Venture Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis			The loan bore interest at a floating rate equal to the One Month LIBOR Rate (with a floor of 0.50%) plus 8.50%. In the event that the One Month LIBOR Rate, as reported in the Wall Street Journal, exceeded 0.50%, the interest rate would have been adjusted by an amount equal to the difference between such rates at the end of that particular month.