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Cash Equivalents and Marketable Securities | 12 Months Ended
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Dec. 31, 2020
Cash Equivalents and Marketable Securities |
Cash Equivalents and Marketable Securities | 3. 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
​ ​ As of December 31, 2020, the Company did not hold any marketable securities that had been in an unrealized loss position for more than twelve months. Furthermore, the Company has determined that there were no material changes in the credit risk of the debt securities. As of December 31, 2020, the Company holds 62 securities with an aggregate fair value of $109.7 million that had remaining maturities between one and two years.

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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