Subsequent Events - Additional Information (Detail)		12 Months Ended
	Feb. 08, 2017 USD ($) Facility $ / shares shares	Dec. 31, 2016	Mar. 31, 2014 USD ($)
Subsequent Event [Line Items]
Borrowing capacity under credit facility			$ 10,000,000
EWB Warrant
Subsequent Event [Line Items]
Warrants expiration date		Feb. 08, 2022
VLL7 Warrant
Subsequent Event [Line Items]
Warrants expiration date		Feb. 08, 2022
VLL8 Warrant
Subsequent Event [Line Items]
Warrants expiration date		Feb. 08, 2022
Term Loan
Subsequent Event [Line Items]
Term loan maturity date		Aug. 08, 2020
Revolving Credit Facility
Subsequent Event [Line Items]
Loan facility payable date		Feb. 08, 2018
Interest payable monthly date		Mar. 01, 2017
Termination fee mature date		Feb. 08, 2018
Revolving Credit Facility | Prime Rate
Subsequent Event [Line Items]
Loan facility payable date		Feb. 08, 2019
Subsequent Event | Opus Warrant, New Opus Warrant 1 and New Opus Warrant 2
Subsequent Event [Line Items]
Warrants to purchase common stock cancelled | shares	400,000
Subsequent Event | EWB Warrant
Subsequent Event [Line Items]
Warrants issued to purchase common stock | shares	40,000
Warrant exercise price | $ / shares	$ 3.64
Warrants expiration period	5 years
Subsequent Event | VLL7 Warrant
Subsequent Event [Line Items]
Warrants issued to purchase common stock | shares	290,000
Warrant exercise price | $ / shares	$ 2.00
Warrants expiration period	5 years
Subsequent Event | VLL8 Warrant
Subsequent Event [Line Items]
Warrants issued to purchase common stock | shares	290,000
Warrant exercise price | $ / shares	$ 2.00
Warrants expiration period	5 years
Subsequent Event | Term Loan
Subsequent Event [Line Items]
Debt instrument, interest per annum rate	12.50%
Debt instrument scheduled interest accrued and payable	80.00%
Debt instrument, interest term	12 months
Subsequent Event | Revolving Credit Facility
Subsequent Event [Line Items]
Line of credit facility early termination fee percentage	1.00%
Line of credit facility additional cash early termination fee percentage	1.00%
Line of credit facility customary fees and expenses including facility fees	$ 120,000
Line of credit facility additional facility fees payable	$ 40,000
Number of closing line of credit facilities | Facility	2
Subsequent Event | Revolving Credit Facility | Minimum
Subsequent Event [Line Items]
Line of credit facility liquidity covenant in cash	$ 4,000,000
Subsequent Event | Revolving Credit Facility | Prime Rate
Subsequent Event [Line Items]
Percentage of interest rate	2.00%
Loan and Security Agreements | Venture Lending & Leasing VII and VIII, Inc. | Subsequent Event
Subsequent Event [Line Items]
Amount borrowed under term loan	$ 10,000,000
Loan and Security Agreements | East West Bank | Subsequent Event
Subsequent Event [Line Items]
Borrowing capacity under credit facility	$ 10,000,000