Fair Value - Change in Fair Value for All Assets and Liabilities Using Unobservable Level 3 Inputs As Determined By Level 3 Inputs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Change in fair value of preferred stock warrant liability recorded in other expense			$ 1,800
Reclassification to additional paid-in capital upon the Merger			1,909
Fair Value, Inputs, Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 0	$ 0	109
Additions for contingent consideration	23,900
Additions		0
Change in fair value of preferred stock warrant liability recorded in other expense			1,800
Change in fair value	(400)
Reclassification to additional paid-in capital upon the Merger			(1,909)
Current portion	12,500
Long-term portion	11,000
Ending balance	$ 23,500	$ 0	$ 0