Fair Value Measurements - Summary of Earn-Out Liability (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Balance at January 1, 2014	$ 3,510
Earn-out consideration		$ 3,510
Balance at December 31, 2014		3,510
Issuance of shares to settle earn-out obligation	(3,510)
Fair Value, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Balance at January 1, 2014	3,510	0
Earn-out consideration	0	3,510
Balance at December 31, 2014	0	$ 3,510
Issuance of shares to settle earn-out obligation	$ (3,510)