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Fair Value Measurements - Recurring (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Transfer between levels    
Transfer of assets from level 1 to 2 $ 0  
Transfer of assets from level 2 to 1 0  
Transfer of liabilities from level 1 to 2 0  
Transfer of liabilities from level 2 to 1 0  
Transfer of assets into level 3 0  
Transfer of assets out of level 3 0  
Transfer of liabilities into level 3 0  
Transfer of liabilities out of level 3 $ 0  
Assets    
Maximum remaining maturity of marketable securities 8 months  
Recurring    
Assets    
Cash equivalents $ 41,369 $ 15,974
Marketable securities 22,865 27,804
Total Assets 64,234 43,778
Recurring | Level 1    
Assets    
Cash equivalents 41,369 15,974
Marketable securities 4,046 6,074
Total Assets 45,415 22,048
Recurring | Level 2    
Assets    
Marketable securities 18,819 21,730
Total Assets $ 18,819 $ 21,730