Accrued expenses and other current liabilities - Summary of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Payables And Accruals [Abstract]
Employee compensation	$ 5,935	$ 4,943
Accrued goods and services	16,153	7,358
Accrued professional fees	1,014	428
Deferred rent, current portion	964	914
Contingent consideration, current	3,584	475
Other	495	531
Total accrued expenses and other current liabilities	$ 28,145	$ 14,649