Accrued Expenses and Other Liabilities - Components of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Components of accrued liabilities
Accrued bonuses	$ 2,890	$ 3,053
Accrued payroll related liabilities	3,524	2,614
Accrued vacation	2,926	2,243
Accrued commissions	1,150	2,537
Accrued software expense	813	844
Accrued contractor fees	395	455
Accrued professional service fees	404	344
Deferred rent	73	74
Income tax related accruals	373	166
Other accrued expenses	1,169	1,167
Total	$ 13,717	$ 13,497