Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Summary of Cash, Cash Equivalents and Short-term Investments (Details)

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Summary of Significant Accounting Policies - Summary of Cash, Cash Equivalents and Short-term Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Cash and cash equivalents    
Cash $ 51,560 $ 33,671
Money market accounts 146,477 158,438
U.S. Treasury securities   4,525
Total cash and cash equivalents 198,037 196,634
Marketable securities    
Marketable securities 11,057 43,715
Corporate Bonds    
Marketable securities    
Marketable securities 2,013 13,613
U.S. Treasury Securities    
Marketable securities    
Marketable securities $ 9,044 $ 30,102