Condensed Consolidated Statements of Changes in Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Dec. 31, 2019	$ 27	$ 56,027	$ (56,061)	$ (7)
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2019	27,028,533
Stock-based compensation expense		1,347		1,347
Issuance of common stock and warrants, pursuant to Securities Purchase Agreement, net of issuance costs, shares	8,865,000
Net loss			(12,651)	(12,651)
Ending balance, value at Sep. 30, 2020	$ 53	75,351	(68,712)	6,692
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2020	53,270,044
Issuance of common stock and warrants, pursuant to     Securities Purchase Agreement, net of issuance costs	$ 9	6,371		6,380
Issuance of common stock, net of issuance costs	$ 15	8,835		8,850
Issuance of common stock, net of issuance costs, shares	15,166,666
Issuance of common stock for prepaid services		330		330
Issuance of common stock for license acquired	$ 2	2,441		2,443
Issuance of common stock for license acquired, shares	1,809,845
[custom:IssuanceOfCommonStockForPrepaidServicesShares]	400,000
Beginning balance, value at Jun. 30, 2020	$ 44	68,285	(64,622)	3,707
Common Stock, Shares, Outstanding, Beginning Balance at Jun. 30, 2020	44,405,044
Stock-based compensation expense		695		695
Issuance of common stock and warrants, pursuant to Securities Purchase Agreement, net of issuance costs, shares	8,865,000
Net loss			(4,090)	(4,090)
Ending balance, value at Sep. 30, 2020	$ 53	75,351	(68,712)	6,692
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2020	53,270,044
Issuance of common stock and warrants, pursuant to     Securities Purchase Agreement, net of issuance costs	$ 9	6,371		6,380
Beginning balance, value at Dec. 31, 2020	$ 54	77,680	(75,162)	$ 2,572
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2020	54,535,891			54,535,891
Stock-based compensation expense		2,599		$ 2,599
Issuance of common stock, options exercised		65		65
Issuance of common stock, options exercised, shares	43,805
Issuance of common stock, ESPP		1		$ 104
Issuance of common stock, ESPP, shares	80,009			80,009
Issuance of common stock for conversion of debt		138		$ 138
Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments	$ 7	8,401		8,408
Warrants exercised for cash, shares	7,431,125
Warrants exercised for cash	$ 7	8,401		8,408
Issuance of common stock for extinguishment of debt, shares	406,250
Net loss			(38,789)	(38,789)
Issuance of common stock for conversion of debt, shares	69,065
Ending balance, value at Sep. 30, 2021	$ 102	186,761	(113,951)	$ 72,912
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2021	102,354,699			102,354,699
Extinguishment of beneficial conversion feature		(1,519)		$ (1,519)
Issuance of common stock for settlement of debt	1	1,376		1,377
Issuance of common stock, net of issuance costs	$ 40	97,917		97,957
Issuance of common stock, net of issuance costs, shares	39,788,554
Beginning balance, value at Jun. 30, 2021	$ 102	185,732	(103,136)	82,698
Common Stock, Shares, Outstanding, Beginning Balance at Jun. 30, 2021	102,271,544
Stock-based compensation expense		85		857
Issuance of common stock, ESPP		74		74
Issuance of common stock, ESPP, shares	39,491
Issuance of common stock for conversion of debt		98		98
Net loss			(10,815)	(10,815)
Issuance of common stock for conversion of debt, shares	43,664
Ending balance, value at Sep. 30, 2021	$ 102	$ 186,761	$ (113,951)	$ 72,912
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2021	102,354,699			102,354,699