2. Liquidity and Going Concern (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended	12 Months Ended
	May 31, 2021	Jan. 31, 2021	Mar. 31, 2021	Dec. 31, 2021	Mar. 31, 2022	May 24, 2021	Jan. 28, 2021
Cash				$ 78,734	$ 61,772
Accumlated deficit				$ 141,210	155,211
Cash received from stock sale			$ 33,481
[custom:FinancingAvailableUnderFormS3ShelfRegistrationStatement-0]					$ 95,100
May 242021 [Member]
Number of shares of common stock issued	22,258,066			22,258,066
Shares Issued, Price Per Share						$ 3.10
Cash received from stock sale	$ 64,500			$ 64,500
Offering proceeds used to partially repay certain convertible promissory notes	$ 7,300			$ 7,300
January 282021 [Member]
Number of shares of common stock issued		17,530,488		17,530,488
Shares Issued, Price Per Share							$ 2.05
Cash received from stock sale		$ 33,500		$ 33,500
Offering proceeds used to partially repay certain convertible promissory notes		$ 3,800		$ 3,800