Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities:
Net loss	$ (15,557,000)	$ (14,893,000)
Adjustments required to reconcile net loss to net cash used in operating activities:
Depreciation	840,000	1,049,000
Stock-based compensation	2,613,000	3,224,000
Non-cash interest expense	457,000	717,000
Change in fair value of derivative liability		(1,117,000)
Changes in operating assets and liabilities:
Award receivable	(241,000)
Accounts payable and accrued liabilities	492,000	(1,171,000)
Accrued compensation	(21,000)	(609,000)
Operating lease right-of-use asset and liability, net	611,000	(252,000)
Prepaid expenses and other current assets	(1,162,000)	199,000
Net cash used in operating activities	(11,968,000)	(12,853,000)
Investing activities:
Purchases of property and equipment	(458,000)	(203,000)
Cash acquired in reverse merger transaction		3,008,000
Net cash (used in) provided by investing activities	(458,000)	2,805,000
Financing activities:
Payment of deferred consideration for asset acquisition	(1,000,000)	(1,000,000)
Proceeds from Paycheck Protection Program Loan	717,000
Proceeds from sale of common stock, net of offering costs	22,893,000	9,975,000
Proceeds from exercise of employee stock options	87,000
Proceeds from exercise of warrants	81,000
Net cash provided by financing activities	22,778,000	8,975,000
Net increase (decrease) in cash, cash equivalents and restricted cash	10,352,000	(1,073,000)
Cash, cash equivalents and restricted cash, beginning of period	6,733,000	10,463,000
Cash, cash equivalents and restricted cash, end of period	17,085,000	9,390,000
Supplemental schedule of non-cash investing and financing activities:
Unpaid offering costs	65,000
Issuance of common stock in reverse merger transaction		10,710,000
Conversion of deferred asset acquisition consideration upon reverse merger		$ 1,463,000
Property and equipment included in accounts payable	$ 145,000