Accrued expenses and other current liabilities - Summary of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Employee compensation	$ 4,394	$ 5,935
Accrued goods and services	18,012	16,153
Accrued professional fees	914	1,014
Deferred rent, current portion	994	964
Contingent consideration, current portion	4,431	3,584
Other	878	495
Total accrued expenses and other current liabilities	$ 29,623	$ 28,145