Accrued Expenses and Other Liabilities - Components of Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Components of accrued liabilities
Accrued bonuses	$ 3,126	$ 2,245
Accrued commissions	2,765	2,229
Accrued vacation	1,983	1,838
Accrued payroll related liabilities	1,682	1,364
Accrued software expense	1,093	1,668
Income tax related accruals	614	498
Deferred rent	513	526
Short-term portion of lease abandonment accrual	475	580
Accrued sales and use tax	275	1,482
Other accrued expenses	1,800	1,850
Total	$ 14,326	$ 14,280