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Equity-based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2019
Equity-based Compensation |  |  |  |  |
Weighted-average grant date fair value (in dollars per share) |  |  | $ 1.79 |  |
Aggregate grant date fair value (in dollars per share) | $ 3 |  | $ 14 |  |
Options granted (in shares) | 0 |  | 67,232 |  |
Fair value of options granted |  |  | $ 121 |  |
Fair value of options vested | $ 83 |  | $ 383 |  |
Options exercised (in shares) | 4,996 |  | 25,783 |  |
Intrinsic value of stock options exercised | $ 26 |  | $ 140 |  |
Compensation expense recognized | 72 | $ 129 | 264 | $ 342 |
Unrecognized compensation expense | 887 |  | 887 |  |
Performance-based awards | Executive |  |  |  |  |
Equity-based Compensation |  |  |  |  |
Options granted (in shares) |  |  |  |  | 349,150
Compensation expense recognized |  |  | 0 |  |
Unrecognized compensation expense | $ 254 |  | $ 254 |  |

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- Definition Represents the total fair value of options granted during the reporting period. + References No definition available. + Details
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- Definition Represents the total fair value of options vested during the reporting period. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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