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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 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | Amortized | ​ | Gross Unrealized | ​ |
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
Money market funds | ​ | $ | 27,481 | ​ | $ | — |  | $ | — | ​ | $ | 27,481
Commercial paper | ​ |  | 65,866 | ​ |  | — |  |  | (3) | ​ |  | 65,863
Corporate debt securities | ​ |  | 27,592 | ​ |  | 2 | ​ |  | (4) | ​ |  | 27,590
U.S. Treasury and agency securities | ​ |  | 183,203 | ​ |  | 10 |  |  | (3) | ​ |  | 183,210
Total cash equivalents and marketable securities | ​ | $ | 304,142 | ​ | $ | 12 |  | $ | (10) | ​ | $ | 304,144
Classified as: | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Cash equivalents | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | $ | 113,693
Marketable securities - current | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  |  | 188,451
Marketable securities - noncurrent | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  |  | 2,000
Total cash equivalents and marketable securities | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | $ | 304,144
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ | ​ | Amortized | ​ | Gross Unrealized | ​ |
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
Money market funds | ​ | $ | 12,964 | ​ | $ | — |  | $ | — | ​ | $ | 12,964
Commercial paper | ​ |  | 44,284 | ​ |  | 2 |  |  | (4) | ​ |  | 44,282
Corporate debt securities | ​ |  | 33,653 | ​ |  | 11 |  |  | (2) | ​ |  | 33,662
U.S. Treasury and agency securities | ​ |  | 40,798 | ​ |  | 14 |  |  | (2) | ​ |  | 40,810
Total cash equivalents and marketable securities | ​ | $ | 131,699 | ​ | $ | 27 |  | $ | (8) | ​ | $ | 131,718
Classified as: | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Cash equivalents | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | $ | 31,707
Marketable securities - current | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  |  | 100,011
Total cash equivalents and marketable securities | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | $ | 131,718

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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