Organization and Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Jan. 15, 2016	Jan. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Organization And Basis Of Presentation [Line Items]
Cash and cash equivalents			$ 36,079	$ 54,059	$ 7,942	$ 7,882
Net working capital			28,700
Accumulated deficit			$ 125,202	$ 91,750
Subsequent Event | Term Loan | Silicon Valley Bank
Organization And Basis Of Presentation [Line Items]
Required collateral amount	$ 15,100	$ 15,100