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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net loss	$ (19,180)	$ (25,406)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation	7	18
Stock-based compensation	3,711	4,055
Changes in assets and liabilities:
Prepaid expenses and other current assets	374	258
Accounts payable	296	636
Other liabilities	97	0
Accrued payroll and related expenses	10	(1,856)
Accounts receivable	1	(6)
Income tax liability	(396)	3
Net cash used in operating activities	(15,080)	(22,298)
Cash flows from investing activities:
Purchase of property and equipment	(14)	0
Purchase of investments	(5,784)	(3,090)
Proceeds from sale or maturity of investments	5,192	2,720
Net cash used in investing activities	(606)	(370)
Cash flows from financing activities:
Proceeds from exercise of options	816	135
Proceeds from sale of common stock	10,539	27,052
Payments on payroll taxes on cashless exercise of RSUs	(145)	(43)
Net cash provided by financing activities	11,210	27,144
Net increase (decrease) in cash and cash equivalents	(4,476)	4,476
Cash and cash equivalents, beginning of period	7,611	3,135
Cash and cash equivalents, end of period	3,135	7,611
Cash paid for income taxes	4	3
ASC 606 [Member]
Cash flows from financing activities:
Deferred revenue reclassified to retained earnings - ASC 606 adoption	$ 0	$ 2,500

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