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Fair Value Measurements - Recurring (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
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 12 months  
Recurring    
Assets    
Cash equivalents $ 19,834 $ 4,252
Marketable securities 38,553 72,828
Total Assets 58,387 77,080
Recurring | Level 1    
Assets    
Cash equivalents 19,834 4,252
Marketable securities 3,029 7,023
Total Assets 22,863 11,275
Recurring | Level 2    
Assets    
Marketable securities 35,524 65,805
Total Assets $ 35,524 $ 65,805