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Earnings (Loss) Per Share (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Earnings (Loss) Per Share |  |
Summary of computation of basic and diluted income (loss) per share | The table below presents the computation of basic and diluted loss per share (in thousands, except for per share amounts): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net loss |  | $ | (3,582) |  | $ | (2,130) |  | $ | (15,696) |  | $ | (21,141)
Net income attributable to the redeemable noncontrolling interest | ​ | ​ | 67 | ​ | ​ | 62 | ​ | ​ | 212 | ​ | ​ | 768
Net income (loss) attributable to noncontrolling interests | ​ | ​ | 137 | ​ | ​ | — | ​ | ​ | (173) | ​ | ​ | —
Allocation of net loss to convertible preferred stock | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Net loss attributable to holders of Class A, Class B, and Class C common stock |  | $ | (3,786) |  | $ | (2,192) |  | $ | (15,735) |  | $ | (21,909)
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average common shares outstanding, basic and diluted | ​ | ​ | 60,840 | ​ | ​ | 39,043 | ​ | ​ | 57,072 | ​ | ​ | 39,009
Net loss per common share, basic and diluted |  | $ | (0.06) |  | $ | (0.06) |  | $ | (0.28) |  | $ | (0.56)
​ | The table below presents the computation of basic and diluted loss per share (in thousands, except for per share amounts):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
Numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net loss | ​ | $ | 11,156 | ​ | $ | (36,919) | ​ | $ | (78,506)
Net (loss) income attributable to the redeemable noncontrolling interest | ​ |  | 820 | ​ |  | 273 | ​ |  | (971)
Allocation of undistributed earnings to convertible preferred stock | ​ |  | 10,336 | ​ |  | — | ​ |  | —
Net income (loss) attributable to holders of Class A common stock and Class B common stock | ​ | $ | — | ​ | $ | (37,192) | ​ | $ | (77,535)
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average common shares outstanding, basic and diluted | ​ |  | 39,027 | ​ |  | 38,571 | ​ |  | 37,856
Net loss per common share, basic and diluted | ​ | $ | 0.00 | ​ | $ | (0.96) | ​ | $ | (2.05)
​
Summary of shares excluded from the computation of diluted loss per share | The table below presents the details of securities that were excluded from the calculation of diluted loss per share as the effect would have been anti-dilutive (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Stock options |  | 24,016 |  | 33,396 |  | 24,016 |  | 33,396
Convertible preferred stock |  | 29,626 |  | 29,626 |  | 29,626 |  | 29,626
​ | The table below presents the details of securities that were excluded from the calculation of diluted loss per share as the effect would have been anti-dilutive (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Stock options |  | 32,127 |  | 35,016 |  | 42,131
Convertible preferred stock |  | 29,626 |  | 29,626 |  | 29,626
​

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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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