Quarterly report pursuant to Section 13 or 15(d)

Balance Sheets Details - Cash and Cash Equivalents (Details)

v3.21.1
Balance Sheets Details - Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Cash and Cash Equivalents [Line Items]      
Adjusted Cost $ 139,748 $ 149,117 $ 87,327
Money Market Funds [Member]      
Cash and Cash Equivalents [Line Items]      
Adjusted Cost 122,075 127,567  
Estimated Fair Value 122,075 127,567  
Cash [Member]      
Cash and Cash Equivalents [Line Items]      
Adjusted Cost $ 17,600 $ 21,500