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Summary of Significant Accounting Policies - Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Level 3    
Fair Value    
Warrant liability   $ 33
Total liabilities measured at fair value   33
Recurring    
Fair Value    
Total assets measured at fair value $ 13,653 12,367
Warrant liability 40 33
Total liabilities measured at fair value 40 33
Recurring | Level 1    
Fair Value    
Total assets measured at fair value 13,653 12,367
Recurring | Level 3    
Fair Value    
Warrant liability 40  
Total liabilities measured at fair value 40  
Recurring | Money market funds    
Fair Value    
Money market funds 13,653 12,367
Recurring | Money market funds | Level 1    
Fair Value    
Money market funds $ 13,653 $ 12,367