v3.20.4

Cash and cash equivalents and marketable securities | 12 Months Ended
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Dec. 31, 2020
Cash and cash equivalents and marketable securities |
Cash and cash equivalents and marketable securities | 5. Cash and cash equivalents and marketable securities Cash and cash equivalents and marketable securities consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Cash and cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​
Cash | ​ | $ | 15,286 | ​ | $ | 6,061
Money market funds | ​ |  | 20,825 | ​ |  | 34,340
Total cash and cash equivalents | ​ | $ | 36,111 | ​ | $ | 40,401
Short-term marketable securities-available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities | ​ | $ | 4,565 | ​ | $ | 40,214
Total short-term marketable securities | ​ | $ | 4,565 | ​ | $ | 40,214
​ All contractual maturities of marketable securities were less than one year at December 31, 2020. Marketable securities consist primarily of debt securities which include commercial paper and debt instruments including notes issued by foreign or domestic industrial and financial corporations and governments which pay in U.S. dollars and carry a rating of A or better. For the years ended December 31, 2020, 2019 and 2018, interest income was $588, $2,012 and $742, respectively, which is included in interest income and other expense, net in the accompanying consolidated statements of operations.

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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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