CONDENSED INTERIM CONSOLIDATED CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Cash flows from operating activities:
Net loss	$ (40,612)	$ (29,357)	$ (76,049)	$ (52,630)	$ (111,581)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,407	588	2,510	1,112	3,153
Asset write-downs and impairment of field equipment	6,425	11	6,430	42	46
Accrued interest expense	(637)	307		719	672
Share-based compensation to employees	5,637	2,632	11,093	4,444	11,860
Amortization of discount (premium)	(39)	88	(56)	143	329
Increase in receivables and prepaid expenses	(1,672)	(2,079)	(2,208)	(3,026)	(5,088)
Increase in inventories	(4,769)	(1,415)	(7,621)	(5,147)	(10,148)
Increase in other long-term assets	(111)	(161)	(278)	(171)	(381)
Increase in trade payables	2,321	3,757	4,144	3,085	6,961
Increase in other payables and accrued expenses	2,399	3,237	756	518	3,579
Increase in employee benefit liabilities, net	32		270	7	133
Increase (decrease) in other long-term liabilities	225	(799)	638	(753)	581
Net cash used in operating activities	(29,394)	(23,191)	(60,371)	(51,657)	(99,884)
Cash flows from investing activities:
Purchase of property and equipment	(2,338)	(1,808)	(3,340)	(2,417)	(4,667)
Purchase of field equipment	(4,274)	(1,142)	(6,100)	(2,180)	(5,604)
Decrease (increase) in restricted cash	(13)	40	(12)	(33)	(26)
Proceeds from maturity of short-term investments		2,000	150,000	47,000	104,000
Purchase of short-term investments		(36,995)	(119,728)	(58,992)	(208,998)
Net cash provided by (used in) investing activities	(6,625)	(37,905)	20,820	(16,622)	(115,295)
Cash flows from financing activities:
Proceeds from issuance of shares, net		94,599		94,599	252,133
Proceeds from long-term loan, net	17	(920)	17	22,886	22,886
Deferred IPO costs		(294)		(294)
Repayment of other long-term loan	(19)	(15)	(35)	(31)	(63)
Purchase of shares in respect of settlement				(5)	(5)
Exercise of options and warrants	904	16	961	19	2,038
Net cash provided by financing activities	902	93,386	943	117,174	276,989
Effect of exchange rate changes on cash and cash equivalents	56		56
Increase (decrease) in cash and cash equivalents	(35,061)	32,290	(38,552)	48,895	61,810
Cash and cash equivalents at the beginning of the period	115,932	74,218	119,423	57,613	57,613
Cash and cash equivalents at the end of the period	80,871	106,508	80,871	106,508	119,423
Cash paid during the period for:
Income taxes	1,587	171	3,169	266	1,489
Interest	$ 1,269	$ 422	$ 1,933	$ 428	$ 1,688