Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Over-Allotment	[1]	Series J Preferred Stock	[2]	Ordinary Shares	Ordinary Shares Over-Allotment	[1]	Preferred Shares	Preferred Shares Series J Preferred Stock	[2]	Additional Capital Paid-in	Additional Capital Paid-in Over-Allotment	[1]	Additional Capital Paid-in Series J Preferred Stock	[2]	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance at Dec. 31, 2013	$ 171,779											$ 367,597						$ (195,818)
Balance (in shares) at Dec. 31, 2013						11,891,421			58,676,017
Share-based compensation to employees	4,624											4,624
Exercise of options and warrants	2,154											2,154
Exercise of options and warrants (in shares)						1,539,993
Net loss	(80,682)																	(80,682)
Balance at Dec. 31, 2014	97,875											374,375						(276,500)
Balance (in shares) at Dec. 31, 2014						13,431,414			58,676,017
Share-based compensation to employees	11,860											11,860
Exercise of options and warrants	2,038											2,038
Exercise of options and warrants (in shares)						731,665
Issuance of shares, net		$ 157,534		$ 94,599									$ 157,534		$ 94,599
Issuance of shares, net (in shares)							7,876,195			4,068,500
Issuance of shares and options in respect of settlement, net of fair value of shares provided as indemnification (Note 14c) (in shares)						(1,005,210)
Conversion of preferred shares to ordinary shares						62,744,517			(62,744,517)
Other comprehensive loss, net of tax benefit of $165 and $38 for the years ended December 2015 and 2016	(1,505)																$ (1,505)
Net loss	(111,581)																	(111,581)
Balance at Dec. 31, 2015	250,820											640,406					(1,505)	(388,081)
Balance (in shares) at Dec. 31, 2015						83,778,581
Share-based compensation to employees	21,441											21,441
Exercise of options and warrants	993											993
Exercise of options and warrants (in shares)						3,195,477
Issuance of shares in connection with employee stock purchase plan	616											616
Issuance of shares in connection with employee stock purchase plan(in shares)						92,388
Tax benefit from share-based award activity	698											698
Other comprehensive loss, net of tax benefit of $165 and $38 for the years ended December 2015 and 2016	(378)																(378)
Net loss	(131,845)																	(131,845)
Balance at Dec. 31, 2016	$ 142,345											$ 664,154					$ (1,883)	$ (519,926)
Balance (in shares) at Dec. 31, 2016						87,066,446

[1] Net of issuance expenses (including underwriter fees) of $15,742

[2] Net of issuance expenses of $319