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Cash Equivalents and Short-Term Investments
 6 Months Ended
Jun. 30, 2021
Cash and Cash Equivalents [Abstract]  
Cash Equivalents and Short-Term Investments Cash Equivalents and Short-Term Investments
The following tables summarize the amortized cost, unrealized gain and loss and estimated fair value of cash equivalents and short-term investments:

June 30, 2021
(in thousands)Amortized CostUnrealized GainUnrealized LossEstimated Fair Value
Cash equivalents
Money market funds$47,682 $— $— $47,682 
Total cash equivalents$47,682 $— $— $47,682 
Short-term investments
Commercial paper$79,725 $— $— $79,725 
Corporate bonds12,682 1 (1)12,682 
Supranational bonds13,198 — (11)13,187 
U.S. Treasury and agency obligations19,522 2 (7)19,517 
Total short-term investments$125,127 $3 $(19)$125,111 
December 31, 2020
(in thousands)Amortized CostUnrealized GainUnrealized LossEstimated Fair Value
Cash equivalents
Money market funds$44,153 $— $— $44,153 
Commercial paper4,500 — — 4,500 
Total cash equivalents$48,653 $— $— $48,653 
Short-term investments
Commercial paper$71,425 $— $— $71,425 
Corporate bonds4,502 3 — 4,505 
U.S. Treasury and agency obligations37,686 7 — 37,693 
Total short-term investments$113,613 $10 $— $113,623 
The contractual maturities of our short-term investments are as follows:
June 30, 2021
(in thousands)Amortized CostEstimated Fair Value
Due within one year$102,583 $102,584 
Due between one and two years22,544 22,527 
Total short-term investments$125,127 $125,111 
At June 30, 2021, cash and cash equivalents included $5.8 million of restricted cash primarily related to collateral for our outstanding letters of credit. At December 31, 2020, cash and cash equivalents included $0.4 million of restricted cash related to collateral for a lease and credit card deposits. At June 30, 2021 and December 31, 2020, cash and cash equivalents excluded $0.3 million and $0.2 million, respectively, of restricted cash related to an account established as collateral for a lease arrangement, which is included in other assets on the consolidated balance sheets.