Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating activities:
Net loss	$ (12,775)	$ (9,888)
Adjustments to reconcile net (loss) to net cash used in operating activities:
Unrealized (gain)/loss on derivatives	0	(167)
Amortization of deferred issuance costs	64	0
Stock-based compensation - consultants	417	272
Stock-based compensation - employees	2,665	1,825
Changes in operating assets and liabilities:
Prepaid expenses	(58)	(40)
Other assets	(7)	12
Accounts payable	580	177
Accrued liabilities	54	(17)
Net cash used in operating activities	(9,060)	(7,826)
Financing activities:
Cash paid for issuance costs	(71)	0
Short swing profit judgment offset with settlement expense	0	18
Issuance of shares, options exercise	0	210
Issuance of shares, warrants exercise	0	2,119
Net cash (used in)/provided by financing activities	(71)	2,347
Increase in cash and cash equivalents	(9,131)	(5,479)
Cash and cash equivalents - Beginning of year	22,781	28,260
Cash and cash equivalents - End of year	13,650	22,781
Non-cash deferred issuance cost (warrant value)	$ 255	$ 0