Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Payables And Accruals [Abstract]
Accrued compensation and related costs	$ 4,647	$ 7,098
Accrued professional services	3,450	2,511
Accrued customer costs	556	534
Accrued insurance premiums	238	476
Other accrued expenses	601	599
Total accrued liabilities	$ 9,492	$ 11,218