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Loan Payable - Additional Information (Detail) (USD $)	6 Months Ended			1 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Silicon Valley Bank Loan Agreement Warrant [Member]	Jun. 30, 2013 Silicon Valley Bank Loan Agreement Warrant [Member] Common Stock [Member]	Apr. 30, 2013 Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Proceeds from loan				$ 9,900,000
Term of loan	3 years
Annual interest rate on loan	6.00%
Period of loan subject to interest payments only	6 months
Period of loan subject to principal and interest payments	30 months
Final fee payment at the end of loan term	1,000,000
Term of warrants expiration		10 years
Number of shares of common stock acquired using warrants			293,531
Exercise price of warrants		1.7034
Warrants expiration period		April 2023
Initial carrying amount assigned to loan, net of discount	9,512,000
Proceeds received under loan agreement	9,900,000
Fair value allocated to warrant	388,000
Note issuance costs	117,000
Cash discount	$ 100,000
Deferred financing costs, discount and accretion percentage	9.00%

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