Accrued Expenses and Other Liabilities - Components of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Components of accrued liabilities
Accrued bonuses	$ 3,575	$ 3,053
Accrued payroll related liabilities	2,597	2,614
Accrued vacation	3,021	2,243
Accrued commissions	983	2,537
Accrued software expense	1,565	844
Accrued contractor fees	385	455
Accrued professional service fees	282	344
Deferred rent	71	74
Income tax related accruals	352	166
Other accrued expenses	1,451	1,167
Total	$ 14,282	$ 13,497