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Fair Value - Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Assets:    
Marketable securities $ 96,752,000 $ 0
Recurring    
Assets:    
Total cash and cash equivalents 98,829,000 74,854,000
Marketable securities 96,752,000  
Total   74,854,000
Liabilities:    
Loans payable   12,880,000
Total   12,880,000
Recurring | Cash in bank balances    
Assets:    
Total cash and cash equivalents 12,035,000  
Recurring | Money Market Funds    
Assets:    
Total cash and cash equivalents 86,794,000  
Recurring | Non-U.S. Government Securities    
Assets:    
Marketable securities 11,265,000  
Recurring | Corporate Debt Securities    
Assets:    
Marketable securities 40,640,000  
Recurring | Asset-backed Securities    
Assets:    
Marketable securities 13,394,000  
Recurring | Commercial Paper    
Assets:    
Marketable securities 31,453,000  
Recurring | Level 1    
Assets:    
Total cash and cash equivalents 98,829,000 74,854,000
Total   74,854,000
Recurring | Level 1 | Cash in bank balances    
Assets:    
Total cash and cash equivalents 12,035,000  
Recurring | Level 1 | Money Market Funds    
Assets:    
Total cash and cash equivalents 86,794,000  
Recurring | Level 2    
Assets:    
Marketable securities 96,752,000  
Recurring | Level 2 | Non-U.S. Government Securities    
Assets:    
Marketable securities 11,265,000  
Recurring | Level 2 | Corporate Debt Securities    
Assets:    
Marketable securities 40,640,000  
Recurring | Level 2 | Asset-backed Securities    
Assets:    
Marketable securities 13,394,000  
Recurring | Level 2 | Commercial Paper    
Assets:    
Marketable securities $ 31,453,000  
Recurring | Level 3    
Liabilities:    
Loans payable   12,880,000
Total   $ 12,880,000