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Marketable Securities
3 Months Ended
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
The following table summarizes the marketable securities held as of March 31, 2021 (in thousands):
Amortized costUnrealized gainsUnrealized lossesFair value
March 31, 2021
Corporate bonds$2,032 $— $(1)$2,031 
Commercial paper20,374 — — 20,374 
Total$22,406 $— $(1)$22,405 
All marketable securities held at March 31, 2021 had maturities of less than 12 months when purchased and are classified as short-term marketable securities on the accompanying consolidated balance sheet. During the three months ended March 31, 2021, there were no marketable securities adjusted for other than temporary declines in fair value.
As of December 31, 2020, the Company held no marketable securities.