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Fair Value Measurements - Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Assets    
Cash and cash equivalents $ 68,413 $ 18,820
Short-term restricted cash 45  
Total assets 68,458 18,820
Level 1    
Assets    
Cash and cash equivalents 68,413 18,820
Short-term restricted cash 45  
Total assets 68,458 18,820
Level 2    
Assets    
Cash and cash equivalents 0 0
Short-term restricted cash 0  
Total assets 0 0
Level 3    
Assets    
Cash and cash equivalents 0 0
Short-term restricted cash 0  
Total assets $ 0 $ 0