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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Sep. 02, 2016
Debt Instrument [Line Items] |  |
Warrant liability | $ 1,761,000 | $ 2,100,000
Debt discount | 2,200,000 |
Long-term debt, net , carrying amount | $ 4,000,000 |
Unterberg Koller Capital Fund L.P. and William W. and Dieva L. Smith [Member] | Note and Warrant Purchase Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Purchase of warrants |  | 1,700,000
Common stock exercise price |  | $ 2.74
Warrants expiration period | 5 years |
Notes and warrants issuance date | Sep. 06, 2016 |
Unterberg Koller Capital Fund L.P. and William W. and Dieva L. Smith [Member] | Senior Subordinated Notes [Member] | Note and Warrant Purchase Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 4,000,000

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