CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net loss	$ (25,869)	$ (24,971)
Adjustments required to reconcile net loss to net cash used in operating activities:
Stock-based compensation	833	583
Depreciation	620	339
Impairment of property and equipment	0	380
Accrued severance pay, net	13	3
Amortization of discount on loan	4	11
Re-evaluation of fair value of warrants to purchase Convertible Preferred Shares		(40)
Re-evaluation of fair value of warrants to purchase Ordinary Shares	(2,491)
Decrease (increase) in other accounts receivable and prepaid expenses	136	(138)
Issuance costs related to warrants to purchase Ordinary Shares	784
Increase (decrease) in deferred revenue	(1,065)	2,131
Increase (decrease) in trade payables	1,010	(467)
Increase in other accounts payable and accrued expenses	175	590
Net cash used in operating activities	(25,850)	(21,579)
Cash flows from investing activities:
Proceeds from maturity of investments in restricted cash	308	703
Purchase of property and equipment	(2,384)	(1,880)
Investment in long-term deposits	(61)	(15)
Net cash used in investing activities	(2,137)	(1,192)
Cash flows from financing activities:
Proceeds from issuance of Convertible Preferred Shares and warrants, net of issuance costs		11,406
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
Proceeds from issuance of Ordinary Shares and warrants, net of issuance costs	19,585
Repayment of loan	(234)	(563)
Proceeds from exercise of options into Ordinary Shares		145
Net cash provided by financing activities	19,351	48,455
Net increase (decrease) in cash and cash equivalents	(8,636)	25,684
Cash and cash equivalents at the beginning of the year	31,851	6,167
Cash and cash equivalents at the end of the year	23,215	31,851
Supplemental disclosure of non-cash investing and financing activities:
Purchase of property and equipment	201	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
Conversion of Warrants to purchase Convertible Preferred Shares into Warrants to purchase Ordinary Shares		87
Cash paid during the year:
Interest	3	30
Taxes on income	$ 446	$ 325