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Summary of Significant Accounting Policies - Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value    
Total assets measured at fair value $ 14,657 $ 14,669
Warrant liability 36 31
Total liabilities measured at fair value 36 31
Level 1 [Member]    
Fair Value    
Total assets measured at fair value 14,657 14,669
Level 3 [Member]    
Fair Value    
Warrant liability 36 31
Total liabilities measured at fair value 36 31
Money Market Funds [Member]    
Fair Value    
Money market funds 14,657 14,669
Money Market Funds [Member] | Level 1 [Member]    
Fair Value    
Money market funds $ 14,657 $ 14,669