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Net Income (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2022
Net Income (Loss) Per Share |
Calculation of Historical Outstanding Dilutive Securities Not Included in Diluted Loss per Share |
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2022 |  | 2021 |  | 2020
2026 Notes convertible to common stock (1) | ​ | 12,172,008 | ​ | 12,172,008 | ​ | 6,086,004
2023 Notes convertible to common stock (1) | ​ | 4,941,739 | ​ | 4,941,739 | ​ | 7,932,791
Outstanding options to purchase common stock | ​ | 9,488 | ​ | 1,707,371 | ​ | 1,585,332
Outstanding restricted stock units | ​ | 98,750 | ​ | 2,642 | ​ | —
Outstanding warrants to purchase common stock | ​ | — | ​ | — | ​ | 10,792
Total potentially dilutive shares excluded from net income (loss) per share | ​ | 17,221,985 | ​ | 18,823,760 | ​ | 15,614,919
​
| (1) | The 2023 Notes and 2026 Notes (defined below) are subject to a capped call arrangement that potentially reduces the dilutive effect as described in “Note 8 - Unsecured Convertible Senior Notes”. Any potential impact of the capped call arrangement is excluded from this table.

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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