CONDENSED INTERIM CONSOLIDATED CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Cash flows from operating activities:
Net loss	$ (35,437)	$ (23,273)	$ (111,581)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,103	524	3,153
Asset write-downs and impairment	5	31	46
Accrued interest expense	637	412	672
Share-based compensation to employees	5,456	1,812	11,860
Amortization of discount (premium)	(17)	55	329
Increase in receivables and prepaid expenses	(536)	(947)	(5,088)
Increase in inventories	(2,852)	(3,732)	(10,148)
Increase in other long-term assets	(167)	(10)	(381)
Increase (decrease) in trade payables	1,823	(672)	6,961
Increase (decrease) in other payables and accrued expenses	(1,643)	(2,719)	3,579
Increase in employee benefit liabilities, net	238	7	133
Increase in other long-term liabilities	413	46	581
Net cash used in operating activities	(30,977)	(28,466)	(99,884)
Cash flows from investing activities:
Purchase of property and equipment	(1,002)	(609)	(4,667)
Purchase of field equipment	(1,826)	(1,038)	(5,604)
Decrease (increase) in restricted cash	1	(73)	(26)
Proceeds from maturity of short-term investments	150,000	45,000	104,000
Purchase of short-term investments	(119,728)	(21,997)	(208,998)
Net cash provided by (used in) investing activities	27,445	21,283	(115,295)
Cash flows from financing activities:
Proceeds from issuance of shares, net			252,133
Proceeds from long-term loan, net		23,806	22,886
Repayment of other long-term loan	(16)	(16)	(63)
Purchase of shares in respect of settlement		(5)	(5)
Exercise of options and warrants	57	3	2,038
Net cash provided by financing activities	41	23,788	276,989
Increase (decrease) in cash and cash equivalents	(3,491)	16,605	61,810
Cash and cash equivalents at the beginning of the period	119,423	57,613	57,613
Cash and cash equivalents at the end of the period	115,932	74,218	119,423
Cash paid during the period for:
Income taxes	1,582	95	1,489
Interest	$ 664	6	$ 1,688
Non-cash investing activity:
Long-term loan issuance costs and discount		$ 1,085