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Fair Value Measurements - Recurring (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
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 10 months  
Recurring    
Assets    
Cash equivalents $ 38,413 $ 38,698
Marketable securities 66,831 75,401
Total Assets 105,244 114,099
Recurring | Level 1    
Assets    
Cash equivalents 38,413 38,698
Total Assets 38,413 38,698
Recurring | Level 2    
Assets    
Marketable securities 66,831 75,401
Total Assets $ 66,831 $ 75,401