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Cash Equivalents and Marketable Securities - Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Fair Value  
Less than 12 months $ 9,085
12 months or greater 2,000
Unrealized Loss  
Less than 12 months (5)
12 months or greater (1)
U.S. treasury debt securities  
Fair Value  
Less than 12 months 2,020
12 months or greater 0
Unrealized Loss  
Less than 12 months (1)
12 months or greater 0
U.S. corporate debt securities  
Fair Value  
Less than 12 months 7,065
12 months or greater 2,000
Unrealized Loss  
Less than 12 months (4)
12 months or greater $ (1)