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Investments (Tables)
 9 Months Ended
Sep. 30, 2021
Investments in privately-held companies [Abstract]  
Equity Securities without Readily Determinable Fair Value The following table summarizes the activity related to our investments in privately-held companies as of September 30, 2021 and December 31, 2020 (in thousands):
September 30, 2021December 31, 2020
Cost of investments$12,933 $3,000 
Cumulative impairment— — 
Cumulative upward adjustment5,314 5,314 
Carrying amount of investments$18,247 $8,314