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Equity Transactions and Stock Incentive Plans - Narrative (Details) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 22, 2020 | Jan. 01, 2020 | Aug. 27, 2015 | Jan. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 12, 2019 | Nov. 07, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  | $ 3,000 | $ 57,000 | $ 26,930,000 |  |
Common stock repurchase, authorized |  |  |  |  |  |  |  | $ 25,000,000 |
Shares repurchased (in shares) |  |  |  |  |  |  | 1,200,000 |  |
Common stock, par value (USD per share) |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  |
Average price per share (USD per share) |  |  |  |  |  |  | $ 16.06 |  |
Shares repurchased, value |  |  |  |  | $ 950,000 |  | $ 19,598,000 |  |
Lyle A. Berman |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | 50,000 |  |  |  |  |  |  |  |
Common stock price per share (USD per share) | $ 19.00 |  |  |  |  |  |  |  |
Accumulated Deficit |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchased, value |  |  |  |  | 950,000 |  | 19,586,000 |  |
Accumulated Deficit | Lyle A. Berman |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchased, value | $ 1,000,000.0 |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock repurchase, authorized |  |  |  |  |  |  |  |  | $ 25,000,000
Initial Public Offering |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock shares resold by shareholders (in shares) |  |  |  | 6,500,000 |  |  |  |  |
Newly issued shares of common stock (in shares) |  |  |  | 975,000 |  |  |  |  |
Proceeds from issuance of common stock |  |  |  | $ 25,600,000 |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Intrinsic value of stock options exercised |  |  |  |  | $ 1,300,000 | $ 1,600,000 | 16,100,000 |  |
Dividend rate variable |  |  |  |  | 0.00% |  |  |  |
Stock options, unrecognized share-based compensation expense |  |  |  |  | $ 200,000 |  |  |  |
Weighted-average period for recognition |  |  |  |  | 2 months 12 days |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock options, unrecognized share-based compensation expense |  |  |  |  |  | $ 6,500,000 |  |  |
Weighted-average period for recognition |  |  |  |  | 1 year 10 months 24 days |  |  |  |
Performance Stock Units (PSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Service period |  |  |  |  | 2 years |  |  |  |
Stock options, unrecognized share-based compensation expense |  |  |  |  |  |  | $ 3,400,000 |  |
Weighted-average period for recognition |  |  |  |  | 1 year 10 months 24 days |  |  |  |
2015 Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expiration term |  |  |  |  | 10 years |  |  |  |
Number of shares authorized (in shares) |  |  | 2,250,000 |  |  |  |  |  |
Number of shares annual increase (in shares) |  | 1,066,403 | 1,800,000 |  |  |  |  |  |
Plan shares annual increase, percentage |  |  | 4.00% |  |  |  |  |  |
Maximum number of shares authorized per one participant (in shares) |  |  | 2,000,000.0 |  | 1,501,007 |  |  |  |

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