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Fair Value of Financial Instruments - Recorded Amount of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Parenthetical) (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Equity Warrant Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity warrant assets, fair value $ 21,000 $ 164,000
Gain (loss) on derivative, net 385,000 (32,000)
Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value adjustment gain (loss) $ 0 $ 1,000