Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Accrued compensation and related costs	$ 5,907	$ 5,198
Accrued professional services	2,717	2,337
Accrued customer costs	337	987
Accrued insurance premiums	632	438
Other accrued expenses	577	893
Total accrued liabilities	$ 10,170	$ 9,853