Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Marketable Securities - Schedule of Cash, Cash Equivalents and Marketable Securities (Details)

v3.20.1
Cash, Cash Equivalents and Marketable Securities - Schedule of Cash, Cash Equivalents and Marketable Securities (Details)
 3 Months Ended
Mar. 31, 2020
USD ($)
item
Mar. 31, 2019
USD ($)
item
Dec. 31, 2019
USD ($)
Cash Equivalents and Marketable Securities      
Marketable Securities, Amortized Cost $ 121,873,000   $ 91,392,000
Marketable Securities, Unrealized Gains 3,000   24,000
Marketable Securities, Fair Value 121,876,000   91,416,000
Realized gains (losses) $ 0 $ 0  
Number of investments adjusted for other-than-temporary declines in fair value | item 0 0  
Number of securities in unrealized loss position for less than twelve months | item 0    
U.S treasury obligations      
Cash Equivalents and Marketable Securities      
Marketable Securities, Amortized Cost $ 5,000,000   49,951,000
Marketable Securities, Unrealized Gains 3,000   24,000
Marketable Securities, Fair Value 5,003,000   49,975,000
Cash and money market funds      
Cash Equivalents and Marketable Securities      
Cash Equivalents, Amortized Cost 116,873,000   29,441,000
Cash Equivalents, Fair value $ 116,873,000   29,441,000
Overnight repurchase agreements      
Cash Equivalents and Marketable Securities      
Cash Equivalents, Amortized Cost     12,000,000
Cash Equivalents, Fair value     $ 12,000,000