Accrued Expenses and Other Liabilities - Components of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Components of accrued liabilities
Accrued short-term contingent earnout consideration	$ 3,711
Accrued bonuses	2,701	$ 4,268
Accrued commissions	1,674	3,012
Accrued vacation	2,755	2,106
Accrued payroll related liabilities	3,044	2,055
Accrued software expense	770	820
Short-term portion of lease abandonment accrual	583	609
Deferred rent	253	400
Accrued sales and use tax	53	274
Other accrued expenses	3,488	2,598
Total	$ 19,032	$ 16,142