2. Liquidity and Going Concern (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended	6 Months Ended		12 Months Ended
	May 31, 2022	May 31, 2021	Jan. 31, 2021	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Apr. 22, 2022	May 24, 2021	Jan. 28, 2021
Cash					$ 41,251		$ 78,734
Accumlated deficit					$ 176,483		$ 141,210
Initial number of calendar days to regain common stock price compliance					180 days
Additional number of calendar days to regain common stock price compliance					180 days
Cash received from stock sale				$ 64,476		$ 97,957
[custom:FinancingAvailableUnderFormS3ShelfRegistrationStatement-0]					$ 95,100
Maximum [Member]
Shares Issued, Price Per Share								$ 1.00
Minimum [Member]
Shares Issued, Price Per Share					$ 1.00
May 122022 Sale Agreement [Member]
Aggregate future offering amount	$ 50,000
Commission rate on gross proceeds of common stock sale	300.00%
May 242021 [Member]
Shares Issued, Price Per Share									$ 3.10
Number of shares of common stock issued		22,258,066					22,258,066
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]
Shares Issued, Price Per Share										$ 2.05
Number of shares of common stock issued			17,530,488				17,530,488
Cash received from stock sale			$ 33,500				$ 33,500
Offering proceeds used to partially repay certain convertible promissory notes			$ 3,800				$ 3,800