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Debt - Loan and Security Agreement and Warrant Agreement - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) d $ / shares	Dec. 31, 2015 USD ($)	Jun. 16, 2015 $ / shares shares	Jun. 11, 2015 USD ($)
Debt Instrument [Line Items]
Fair value of warrant derivative liabilities at issuance, recorded as debt discount	$ 35,000	$ 11,000
Debt issuance costs		$ 43,000
Hercules Loan and Security Agreement [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Term loan principal amount				$ 7,000,000
Debt instrument basis spread	9.50%
Interest rate during the period	10.00%	9.75%
Basis of debt instrument interest rate	The prime rate as reported by The Wall Street Journal minus 3.25% plus (b) 9.50%.
Debt instrument payment terms	The Company is required to make interest payments in cash on the first business day of each month, beginning on July 1, 2015. The Term Loan interest rate was 10.00% and 9.75% at December 31, 2016 and 2015, respectively. On August 1, 2016, the Company began making monthly payments on the first business day of each month consisting of principal and interest based upon a 30-month amortization schedule
Debt instrument periodic payment frequency	30-month amortization schedule
Repayment charges	$ 245,000
Percentage of prepayment fee	1.00%
Percentage of prepayment fee	3.00%
Maximum principal amount available for conversion into common shares	$ 1,000,000
Debt instrument, convertible, stock price trigger \| $ / shares	$ 11.73
Debt instrument, convertible, threshold trading days \| d	7
Number of shares available for purchase of common stock in warrants \| shares			25,150
Common stock exercise price \| $ / shares			$ 8.35
Warrants expiration date	Jun. 16, 2020
Interest expense	$ 881,000	$ 476,000
Interest expense payable in cash	669,000	368,000
Accretion of debt discount	112,000	52,000
Debt issuance costs	16,000	$ 9,000
Hercules Loan and Security Agreement [Member] \| Term Loan [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Repurchase of securities	$ 1,000,000
Hercules Loan and Security Agreement [Member] \| Term Loan [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Floating annual rate	9.50%
Hercules Loan and Security Agreement [Member] \| Term Loan [Member] \| Private Placement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Repurchase of securities	$ 10,000,000
Hercules Loan and Security Agreement [Member] \| Term Loan [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Debt instrument basis spread	3.25%