Fair Value Measurements - Summary of Changes in the Fair Value of the Liability (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Payment of contingent consideration			$ (400)	$ (400)
Fair value adjustment of contingent consideration	$ (179)	$ 925	(290)	$ 857
NLEX [Member] | Contingent Consideration [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance			2,733
Payment of contingent consideration			(400)
Fair value adjustment of contingent consideration			290
Ending balance	$ 2,623		$ 2,623