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Summary of Significant Accounting Policies - Antidilutive Securities Table (Details) - shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect |  |  |
Total antidilutive securities (shares) | 16,190,768 | 30,737,956 | 10,449,150
Options to purchase common stock |  |  |
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect |  |  |
Total antidilutive securities (shares) | 8,906,624 | 9,265,390 | 8,752,677
Service-based restricted stock units |  |  |
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect |  |  |
Total antidilutive securities (shares) | 2,558,052 | 2,069,936 | 1,688,017
Performance-based restricted stock units |  |  |
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect |  |  |
Total antidilutive securities (shares) | 663,353 | 0 | 0
Convertible preferred stock |  |  |
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect |  |  |
Total antidilutive securities (shares) | 3,309 | 8,456 | 8,456
6.50% Convertible Senior Notes Due 2024 | Convertible Debt Securities |  |  |
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect |  |  |
Total antidilutive securities (shares) | 3,049,980 | 14,585,653 | 0
August 2019 Bonds | Convertible Debt Securities |  |  |
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect |  |  |
Total antidilutive securities (shares) | 0 | 3,799,071 | 0
December 2019 Bonds | Convertible Debt Securities |  |  |
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect |  |  |
Total antidilutive securities (shares) | 1,009,450 | 1,009,450 | 0

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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