CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net loss	$ (24,971)	$ (19,040)
Adjustments required to reconcile net loss to net cash used in operating activities:
Stock-based compensation	583	233
Depreciation	339	204
Impairment of property and equipment	380	0
Accrued severance pay, net	3	13
Amortization of discount on loan	11	12
Revaluation of fair value of warrants to purchase Convertible Preferred Shares	(40)	2,927
Decrease (increase) in other accounts receivable and prepaid expenses	(138)	291
Increase in deferred revenues	2,131
Increase (decrease) in trade payables	(467)	1,190
Increase in other accounts payable and accrued expenses	590	799
Net cash used in operating activities	(21,579)	(13,371)
Cash flows from investing activities:
Proceeds from maturity of investment in restricted cash	703	703
Purchase of property and equipment	(1,880)	(948)
Investment in lease deposit	(15)
Net cash used in investing activities	(1,192)	(245)
Cash flows from financing activities:
Proceeds from issuance of Preferred shares and warrants, net of issuance costs	11,406	19,206
Deferred IPO costs		(933)
Proceeds from issuance of Ordinary Shares, net of issuance costs upon IPO	36,159
Proceeds from issuance of Ordinary Shares, net of underwriters' fees	1,308
Repayment of loan	(563)	(563)
Proceeds from exercise of options into Ordinary Shares	145	1
Net cash provided by financing activities	48,455	17,711
Net increase in cash and cash equivalents	25,684	4,095
Cash and cash equivalents at the beginning of the year	6,167	2,072
Cash and cash equivalents at the end of the year	31,851	6,167
Supplemental disclosure of non-cash investing and financing activities:
Purchase of property and equipment	48
Conversion of Convertible Preferred Shares into Ordinary Shares	47,075
Conversion of Warrants to purchase Convertible Preferred Shares into Ordinary Shares	5,945
Non-cash deferred IPO costs	933	529
Conversion of warrants to purchase Convertible Preferred Shares into warrants to purchase Ordinary Shares	87
Cash paid during the year:
Interest	30	$ 60
Taxes on income	$ 325