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Net Loss Per Share (Tables) | 6 Months Ended
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Jun. 30, 2022
Net Loss Per Share |
Calculation of Historical Outstanding Dilutive Securities Not Included in Diluted Loss per Share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021
2023 Notes convertible to common stock (1) | ​ | 4,941,739 | ​ | 4,941,739 | ​ | 4,941,739 | ​ | 4,941,739
Outstanding options to purchase common stock | ​ | 88 |  | 2,401,024 | ​ | 1,963 |  | 2,901,430
Outstanding restricted stock units | ​ | 208,819 | ​ | — | ​ | 207,736 | ​ | —
Total potentially dilutive shares excluded from net loss per share | ​ | 5,150,646 |  | 7,342,763 | ​ | 5,151,438 |  | 7,843,169
​ (1)The 2023 Notes 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 http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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