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Cash Equivalents and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Cash Equivalents and Marketable Securities |
Schedule of cash equivalents and marketable securities | Cash equivalents and marketable securities consisted of the following at December 31, 2020 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Allowance | ​ | ​ | Gross | ​ | Gross | ​ | ​
​ | ​ | Amortized | ​ | for Credit | ​ | ​ | Unrealized | ​ | Unrealized | ​ | Fair
December 31, 2020 | ​ | Cost | ​ | Losses | ​ | ​ | Gains | ​ | Losses | ​ | Value
Cash equivalents and marketable securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 139,682 | ​ | $ | — | ​ | ​ | $ | — | ​ | $ | — | ​ | $ | 139,682
U.S. Treasuries | ​ | ​ | 180,376 | ​ | ​ | — | ​ | ​ | ​ | 8 | ​ | ​ | (11) | ​ | ​ | 180,373
Government agency securities | ​ | ​ | 107,665 | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​ | (20) | ​ | ​ | 107,645
Commercial paper | ​ | ​ | 41,912 | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​ | (8) | ​ | ​ | 41,904
Corporate notes/bonds | ​ | ​ | 42,185 | ​ | ​ | — | ​ | ​ | ​ | 10 | ​ | ​ | (25) | ​ | ​ | 42,170
Total | ​ | $ | 511,820 | ​ | $ | — | ​ | ​ | $ | 18 | ​ | $ | (64) | ​ | $ | 511,774
​ Cash equivalents and marketable securities consisted of the following at December 31, 2019 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
December 31, 2019 | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
Cash equivalents and marketable securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 230,201 | ​ | $ | — | ​ | $ | — | ​ | $ | 230,201
U.S. Treasuries | ​ | ​ | 71,348 | ​ | ​ | 20 | ​ | ​ | — | ​ | ​ | 71,368
Government agency securities | ​ | ​ | 155,484 | ​ | ​ | 87 | ​ | ​ | — | ​ | ​ | 155,571
Equity securities included in other non-current assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate equity securities | ​ | ​ | 3,667 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,667
Total | ​ | $ | 460,700 | ​ | $ | 107 | ​ | $ | — | ​ | $ | 460,807

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