Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss	$ (8,092,000)	$ (8,169,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	1,337,000	763,000
Amortization of discount on marketable securities	(24,000)	(68,000)
Non-cash lease expense	39,000	36,000
Depreciation	16,000	16,000
Changes in operating assets and liabilities:
Amounts receivable	488,000	116,000
Prepaid expenses	(91,000)	280,000
Deposits	78,000	(39,000)
Accounts payable	538,000	(171,000)
Accrued liabilities	(458,000)	(1,000)
Net cash used in operating activities	(6,169,000)	(7,237,000)
Cash flows from investing activities:
Purchase of marketable securities	(25,048,000)	(10,928,000)
Maturities of marketable securities	8,249,000	6,000,000
Purchase of property and equipment	(2,000)
Disposition of property and equipment, net		12,000
Net cash used in investing activities	(16,801,000)	(4,916,000)
Cash flows from financing activities:
Proceeds from issuance of common shares, net of offering costs	28,872,000
Proceeds from the exercise of stock options	16,000	75,000
Principal payments on finance lease obligations	(4,000)	(4,000)
Net cash provided by financing activities	28,884,000	71,000
Net increase (decrease) in cash and cash equivalents	5,914,000	(12,082,000)
Cash and cash equivalents at beginning of period	3,883,000	16,823,000
Cash and cash equivalents at end of period	$ 9,797,000	$ 4,741,000