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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (14,694)	$ (18,989)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	4	14
Stock-based compensation	2,712	3,026
Changes in assets and liabilities:
Prepaid expenses and other assets	286	89
Accounts payable and accrued liabilities	118	(18)
Accrued payroll and related expenses	62	(1,882)
Accounts receivable	0	(4)
Income tax liability	(396)	5
Net cash used in operating activities	(11,908)	(17,759)
Cash flows from investing activities:
Purchase of investments	(5,319)	(1,430)
Proceeds from sale or maturity of investments	4,503	2,219
Net cash (used in) provided by investing activities	(816)	789
Cash flows from financing activities:
Proceeds from exercise of options	816	0
Proceeds from sale of common stock	6,916	25,273
Payments of taxes on cashless exercise of restricted stock units	(47)	(42)
Net cash provided by financing activities	7,685	25,231
Net increase (decrease) in cash and cash equivalents	(5,039)	8,261
Cash and cash equivalents, beginning of period	7,611	3,135
Cash and cash equivalents, end of period	2,572	11,396
Cash paid for income taxes	0	3
ASC 606 [Member]
Non-cash transactions
Deferred revenue reclassified to retained earnings - ASC 606 adoption	$ 0	$ 2,500

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