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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