CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net loss	$ (26,706)	$ (13,430)
Adjustments required to reconcile net loss to net cash used in operating activities:
Stock-based compensation	477	380
Depreciation	386	289
Accrued severance pay, net	8	16
Increase in fair value of warrants to purchase Ordinary Shares	15,496
Increase in other accounts receivable and prepaid expenses	(52)	(239)
Allocation of issuance costs related to warrants to purchase Ordinary Shares	441
Decrease in deferred revenue	(635)	(469)
Decrease in trade payables	(742)	(150)
Decrease in other accounts payable and accrued expenses	(608)	(247)
Net cash used in operating activities	(11,935)	(13,850)
Cash flows from investing activities:
Proceeds from maturity of investment in restricted cash		308
Purchase of property and equipment	(887)	(768)
Decrease (Increase) in other assets	56	(60)
Net cash used in investing activities	(831)	(520)
Cash flows from financing activities:
Repayment of loan		(234)
Proceeds from warrants exercised by shareholders	4,866
Proceeds from options exercise by employees	119
Proceeds from issuance of Ordinary Shares and warrants, net of issuance costs	28,110
Net cash provided by (used in) financing activities	33,095	(234)
Net increase (decrease) in cash and cash equivalents	20,329	(14,604)
Cash and cash equivalents at the beginning of the period	23,215	31,851
Cash and cash equivalents at the end of the period	43,544	17,247
Supplemental disclosure of non-cash investing and financing activities:
Purchase of property and equipment	33	240
Exercise of warrants into Ordinary Shares	5,177
Cash paid during the period:
Cash paid for interest		3
Cash paid for taxes	$ 220	$ 310