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Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Schedule of Calculation of Basic and Diluted Earnings per Share | The calculation of basic and diluted earnings per share was as follows (in thousands, except share and per share data):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019 |  |
Net loss attributable to common stockholders | $ | (52,368) |  |  | $ | (114,119) |  |  | $ | (40,486) |  |  |
Weighted-average common shares outstanding | 103,246,308 |  |  | 96,111,547 |  |  | 78,322,496 |  |  |
Basic and diluted net loss per share | $ | (0.51) |  |  | $ | (1.19) |  |  | $ | (0.52) |  |  |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The following is a summary of outstanding anti-dilutive potential common stock that was excluded from diluted net loss per share attributable to stockholders in the following periods:
| Year Ended December 31,
(in thousands) | 2021 |  | 2020 |  | 2019
Convertible notes | 14,341 |  |  | 14,784 |  |  | 22,314 |
Warrants | 2,500 |  |  | 2,500 |  |  | 2,838 |
Non-qualified stock options | 8,086 |  |  | 8,480 |  |  | 9,027 |
Restricted stock units | 1,248 |  |  | 417 |  |  | 414 |
Employee Stock Purchase Plan | 144 |  |  | 25 |  |  | 98 |
Rights agreement | — |  |  | — |  |  | 198 |

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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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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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