Debt Instruments - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 23, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Debt Instrument [Line Items]
Interest Paid				$ 223,708	$ 237,500
Venture Loan [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt	$ 5,000,000
Debt Instrument, Interest Rate, Stated Percentage	9.00%	9.00%		9.00%
Debt Instrument, Payment Terms	The loan is 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 will be 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	$ 88,918
Intrinsic Value Of Warrants	261,386
Interest Expense, Other	$ 225,000
Debt Instrument, Unamortized Discount		$ 210,000		$ 210,000
Interest Paid		110,000	$ 124,000	224,000	238,000
Paid-in-Kind Interest		$ 38,000	$ 38,000	$ 77,000	$ 77,000
Venture Loan [Member] | Horizon Technology Finance Corporation [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis	The loan bears 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, exceeds 0.50%, the interest rate will be adjusted by an amount equal to the difference between such rates at the end of that particular month