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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Current liabilities    
Deferred revenue, customer deposits $ 3,163,000 $ 31,000
Convertible redeemable preferred stock and Redeemable non-controlling interest:    
Convertible redeemable preferred stock, Series A shares issued (in shares) 7,000,000 7,000,000
Convertible redeemable preferred stock, Series A shares outstanding (in shares) 7,000,000 7,000,000
Convertible redeemable preferred stock, Series A liquidation and deemed liquidation preference (in shares) $ 3,500,000,000 $ 3,500,000,000
Equity:    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 1,500,000,000 1,500,000,000
Common stock, shares issued (in shares) 497,272,525 344,861,295
Common stock, shares outstanding (in shares) 497,272,525 344,861,295