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Debt - Loan and Security Agreement and Warrant Agreement - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) d $ / shares	Sep. 30, 2014 USD ($)	Jun. 16, 2015 $ / shares shares	Jun. 11, 2015 USD ($)	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Interest expense payable in cash							$ 3,338,000
Hercules Loan and Security Agreement [Member]
Debt Instrument [Line Items]
Fair value of warrant derivative liabilities at issuance, recorded as debt discount			$ 11,000
Interest expense	$ 20,000	$ 7,375,000	$ 430,000	$ 13,339,000
Hercules Loan and Security Agreement [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Term loan principal amount						$ 7,000,000
Floating annual rate			9.50%
Debt instrument basis spread			8.50%
Basis of debt instrument interest rate			The prime rate as reported by The Wall Street Journal minus 3.25% plus (b) 8.50%.
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. Beginning on August 1, 2016, the Company will be required to make 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%		1.00%
Percentage of prepayment fee	3.00%		3.00%
Maximum principal amount available for conversion into common shares	$ 1,000,000		$ 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	220,000		$ 253,000
Interest expense payable in cash	170,000		170,000
Hercules Loan and Security Agreement [Member] \| Term Loan [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Repurchase of securities	1,000,000		1,000,000
Hercules Loan and Security Agreement [Member] \| Term Loan [Member] \| Private Placement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Repurchase of securities	$ 10,000,000		$ 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%