Accrued Expenses and Other Liabilities - Components of Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Components of accrued liabilities
Accrued bonuses	$ 2,095	$ 3,126
Accrued vacation	2,497	1,983
Accrued payroll related liabilities	2,342	1,682
Accrued commissions	1,636	2,765
Accrued software expense	890	1,093
Income tax related accruals	663	588
Deferred rent	532	513
Short-term portion of lease abandonment accrual	449	475
Accrued sales and use tax	165	275
Other accrued expenses	2,491	1,826
Total	$ 13,760	$ 14,326