Fair Value Measurements - Summary of Changes in the Fair Value of the Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value adjustment of contingent consideration	$ (111)	$ (68)
NLEX [Member] | Contingent Consideration [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	2,733
Fair value adjustment of contingent consideration	111
Ending balance	$ 2,844