CONDENSED INTERIM CONSOLIDATED CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Cash flows from operating activities:
Net loss	$ (33,628)	$ (26,023)	$ (109,677)	$ (78,653)	$ (111,581)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,553	893	4,063	2,005	3,153
Asset write-downs and impairment of field equipment	10		6,440	42	46
Increase (decrease) in accrued interest expense	222	(565)	222	154	672
Share-based compensation to employees	5,626	2,928	16,719	7,372	11,860
Amortization of discount	81	88	25	231	329
Decrease (increase) in receivables and prepaid expenses	694	(1,427)	(1,514)	(4,453)	(5,088)
Increase in inventories	(2,757)	(2,556)	(10,378)	(7,703)	(10,148)
Decrease (increase) in other long-term assets	(526)	250	(804)	79	(381)
Increase (decrease) in trade payables	(6,765)	1,512	(2,621)	4,597	6,961
Increase in other payables and accrued expenses	1,651	2,374	2,407	2,892	3,579
Increase (decrease) in employee benefit liabilities, net	80	(10)	350	(3)	133
Increase (decrease) in other long-term liabilities	263	430	901	(323)	581
Net cash used in operating activities	(33,496)	(22,106)	(93,867)	(73,763)	(99,884)
Cash flows from investing activities:
Purchase of property and equipment	(1,715)	(1,196)	(5,055)	(3,613)	(4,667)
Purchase of field equipment	(3,113)	(1,367)	(9,213)	(3,547)	(5,604)
Decrease (increase) in restricted cash	27	(72)	15	(105)	(26)
Proceeds from maturity of short-term investments	120,000	30,000	270,000	77,000	104,000
Purchase of short-term investments	(119,613)		(239,341)	(58,992)	(208,998)
Net cash provided by (used in) investing activities	(4,414)	27,365	16,406	10,743	(115,295)
Cash flows from financing activities:
Proceeds from issuance of shares, net				94,599	252,133
Proceeds from long-term loan, net	72,870		72,887	22,886	22,886
Deferred IPO costs		(1,439)		(1,733)
Repayment of other long-term loan	(17)	(16)	(52)	(47)	(63)
Purchase of shares in respect of settlement				(5)	(5)
Exercise of options and warrants		12	961	31	2,038
Net cash provided by (used in) financing activities	72,853	(1,443)	73,796	115,731	276,989
Effect of exchange rate changes on cash and cash equivalents	8		64
Increase (decrease) in cash and cash equivalents	34,951	3,816	(3,601)	52,711	61,810
Cash and cash equivalents at the beginning of the period	80,871	106,508	119,423	57,613	57,613
Cash and cash equivalents at the end of the period	115,822	110,324	115,822	110,324	119,423
Cash paid during the period for:
Income taxes	4,624	658	7,793	1,683	1,489
Interest	$ 1,880	$ 1,252	$ 3,813	$ 823	$ 1,688