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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	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, 2018	Dec. 31, 2017	Dec. 31, 2016
Selected Quarterly Financial Information [Abstract]
Net revenues	$ 69,674	$ 64,756	$ 61,514	$ 52,125	$ 53,661	$ 50,109	$ 38,376	$ 34,880	$ 30,242	$ 21,674	$ 17,919	$ 13,053	$ 248,069	$ 177,026	$ 82,888
Gross profit	46,646	45,807	41,681	33,887	38,021	34,956	25,224	23,216	19,268	10,556	1,710	5,071	168,021	121,417	36,606
Operating income (loss)	(8,664)	(5,246)	(7,085)	(12,677)	(4,506)	(5,919)	(15,530)	(13,373)	(17,877)	(28,265)	(37,237)	(31,938)	(33,672)	(39,328)	(115,317)
Net income (loss)	$ (15,631)	$ (11,694)	$ (15,510)	$ (20,724)	$ (10,945)	$ (11,498)	$ (21,174)	$ (18,045)	$ (22,168)	$ (33,628)	$ (40,612)	$ (35,437)	$ (63,559)	$ (61,662)	$ (131,845)
Basic and diluted net income (loss) per ordinary share	$ (0.17)	$ (0.13)	$ (0.17)	$ (0.23)	$ (0.12)	$ (0.13)	$ (0.24)	$ (0.21)	$ (0.26)	$ (0.39)	$ (0.48)	$ (0.42)	$ (0.69)	$ (0.70)	$ (1.54)
Weighted average number of ordinary shares used in computing basic and diluted net income (loss) per share	93,083,298	92,911,375	91,331,862	89,985,612	89,389,364	89,125,646	88,218,868	87,452,983	86,760,316	85,774,874	85,274,683	84,397,164	91,828,043	88,546,719	85,558,448