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Investments in Non-Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Non-marketable Debt Securities As of December 31, 2020, the adjusted cost, carrying value and fair value of the non-marketable debt security is the following (in thousands):
 December 31, 2020
Adjusted Cost and Carrying ValueFair Value
Non-marketable debt securities due in 1 year or less$1,000 $1,000 
Carrying Value of Non-marketable Equity Securities The following table presents the carrying value of non-marketable equity securities (in thousands):
December 31, 2021December 31, 2020
Non-marketable equity securities$14,002 $1,450