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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Stockholders' Equity |
Schedule of common stock were issuable upon exercise of stock options and the conversion of convertible senior notes and Series C Preferred stock | As of December 31, 2020, approximately 18.8 million shares of common stock were issuable upon exercise of stock options and the conversion of convertible senior notes and Series C Preferred stock, as follows: ​
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Exercise of stock options |  | 7,554,305
Conversion of Series C Preferred stock | ​ | 6,474,135
Conversion of convertible senior notes | ​ | 4,810,002
Total shares of common stock reserved for future issuances |  | 18,838,442

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