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Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | $ 2,397 | $ 3,672 | $ 7,175 | $ 10,277
Continuing operations |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | 2,026 | 2,627 | 5,977 | 7,899
Continuing operations | Stock options, net of estimated forfeitures |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | 72 | 297 | 349 | 1,024
Continuing operations | Restricted stock awards |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | 1,954 | 2,330 | 5,628 | 6,875
Discontinued operations |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | $ 371 | $ 1,045 | $ 1,198 | $ 2,378

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