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Investments in Non-Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 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):
 March 31, 2021
Adjusted Cost and Carrying ValueFair Value
Non-marketable debt security due in 1 year or less$1,067 $1,067 

 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):
 March 31, 2021December 31, 2020
Non-marketable equity securities$2,350 $1,450