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Cash Equivalents and Marketable Securities - Continuous Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Fair Value  
Less than 12 months $ 48,338
12 months or greater 0
Unrealized Loss  
Less than 12 months (124)
12 months or greater 0
U.S. corporate debt securities  
Fair Value  
Less than 12 months 48,338
12 months or greater 0
Unrealized Loss  
Less than 12 months (124)
12 months or greater $ 0