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Investments in Non-Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Details of Non-marketable Debt Securities The following table presents balances of the adjusted cost and carrying value and fair value of non-marketable debt security by contractual maturity (in thousands):
 June 30, 2021
Adjusted Cost and Carrying ValueFair Value
Non-marketable debt security due in 1 year or less$1,289 $1,289 
December 31, 2020
Adjusted Cost and Carrying ValueFair Value
Non-marketable debt security due in 1 year or less$1,000 $1,000 
Carrying Value of Non-marketable Equity Securities The following table presents balances of the carrying value of non-marketable equity securities (in thousands):
 June 30, 2021December 31, 2020
Non-marketable equity securities$3,430 $1,450