Accrued Expenses and Other Liabilities - Components of Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Components of accrued liabilities
Accrued bonuses	$ 2,737	$ 3,126
Accrued vacation	2,635	1,983
Accrued payroll related liabilities	1,569	1,682
Accrued commissions	1,909	2,765
Accrued software expense	1,315	1,093
Income tax related accruals	896	588
Deferred rent	477	513
Short-term portion of lease abandonment accrual	609	475
Accrued sales and use tax	281	275
Other accrued expenses	2,228	1,826
Total	$ 14,656	$ 14,326