Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Accrued compensation and related costs	$ 7,098	$ 5,198
Accrued professional services	2,511	2,337
Accrued customer costs	534	987
Accrued insurance premiums	476	438
Other accrued expenses	599	893
Total accrued liabilities	$ 11,218	$ 9,853