Accrued expenses and other current liabilities - Summary of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Employee compensation	$ 5,780	$ 5,935
Accrued goods and services	19,210	16,153
Accrued professional fees	1,861	1,014
Deferred rent, current portion	1,013	964
Contingent consideration, current portion	2,914	3,584
Other	1,032	495
Total accrued expenses and other current liabilities	$ 31,810	$ 28,145