Financial Expenses, Net - Schedule of Financial Expenses, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financial expenses:
Interest expense	$ (10,261)	$ (5,937)	$ (2,373)
Amortization of credit facility costs	(1,111)	(667)	(329)
Foreign currency transaction losses		(396)	(356)
Others	(321)	(318)	(177)
Financial expenses	(11,693)	(7,318)	(3,235)
Financial income:
Amortization of treasury bills premium	859	512
Foreign currency transaction gains	549
Interest income	1,116	659	84
Financial income	2,524	1,171	84
Total financial expenses, net	$ (9,169)	$ (6,147)	$ (3,151)