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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Net revenues	$ 30,242	$ 21,674	$ 17,919	$ 13,053	$ 12,383	$ 8,953	$ 6,543	$ 5,208	$ 82,888	$ 33,087	$ 15,490
Gross profit	19,268	10,556	1,710	5,071	6,079	3,294	1,793	1,311	36,606	12,477	5,454
Operating loss	(17,877)	(28,265)	(37,237)	(31,938)	(30,606)	(24,238)	(27,206)	(21,946)	(115,317)	(103,996)	(80,156)
Net loss	$ (22,168)	$ (33,628)	$ (40,612)	$ (35,437)	$ (32,928)	$ (26,023)	$ (29,357)	$ (23,273)	$ (131,845)	$ (111,581)	$ (80,682)
Basic and diluted net loss per ordinary share	$ (0.26)	$ (0.39)	$ (0.48)	$ (0.42)	$ (0.39)	$ (2.09)	$ (2.36)	$ (1.77)	$ (1.54)	$ (3.67)	$ (6.46)
Weighted average number of ordinary shares used in computing basic and diluted net loss per share	86,760,316	85,774,874	85,274,683	84,397,164	83,607,037	12,431,586	12,427,442	13,140,321	85,558,448	30,401,603	12,490,017