Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Contingent Consideration
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	$ 3,750
Net increase in fair value upon revaluation	400
Contingent consideration recognized from acquisition		$ 3,775
Foreign currency impact	(118)	(25)
Ending balance	$ 4,032	3,750
Preferred Stock Warrant Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance		100
Net increase in fair value upon revaluation		1,108
Reclassification to additional paid-in capital		(1,208)
Common Stock Warrant Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance		889
Net increase in fair value upon revaluation		24,969
Reclassification to additional paid-in capital		$ (25,858)