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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net loss	$ (14,055)	$ (7,691)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	10	15
Stock-based compensation	2,008	1,715
Changes in assets and liabilities:
Prepaid expenses and other assets	(80)	(13)
Accounts payable and accrued liabilities	2,552	(1,362)
Accrued payroll and related expenses	(1,923)	(1,303)
Accounts receivables	(2)	0
Income tax liability	6	(1)
Deferred revenue	0	(750)
Net cash used in operating activities	(11,484)	(9,390)
Cash flows from investing activities:
Purchase of investments	(924)	(756)
Proceeds from sale or maturity of investments	1,635	5,760
Net cash provided by investing activities	711	5,004
Cash flows from financing activities:
Proceeds from sale of common stock	11,639	0
Payments of taxes on restricted stock units	(33)	(29)
Net cash provided by (used in) financing activities	11,606	(29)
Net change in cash and cash equivalents	833	(4,415)
Cash and cash equivalents, beginning of period	3,135	6,627
Cash and cash equivalents, end of period	3,968	2,212
ASU Topic 606 [Member]
Non-cash transactions
Deferred revenue reclassified to retained earnings - ASC 606 adoption	$ 2,500	$ 0

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