Selected Quarterly Financial Information (Unaudited) - Summary of Selected Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Selected Quarterly Financial Information [Abstract]
Net revenues	$ 53,661	$ 50,109	$ 38,376	$ 34,880	$ 30,242	$ 21,674	$ 17,919	$ 13,053	$ 177,026	$ 82,888	$ 33,087
Gross profit	38,021	34,956	25,224	23,216	19,268	10,556	1,710	5,071	121,417	36,606	12,477
Operating loss	(4,506)	(5,919)	(15,530)	(13,373)	(17,877)	(28,265)	(37,237)	(31,938)	(39,328)	(115,317)	(103,996)
Net loss	$ (10,945)	$ (11,498)	$ (21,174)	$ (18,045)	$ (22,168)	$ (33,628)	$ (40,612)	$ (35,437)	$ (61,662)	$ (131,845)	$ (111,581)
Basic and diluted net loss per ordinary share	$ (0.12)	$ (0.13)	$ (0.24)	$ (0.21)	$ (0.26)	$ (0.39)	$ (0.48)	$ (0.42)	$ (0.70)	$ (1.54)	$ (3.67)
Weighted average number of ordinary shares used in computing basic and diluted net loss per share	89,389,364	89,125,646	88,218,868	87,452,983	86,760,316	85,774,874	85,274,683	84,397,164	88,546,719	85,558,448	30,401,603