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Equity Transactions and Stock Incentive Plans (Details Textual) - USD ($)				1 Months Ended	12 Months Ended
	Mar. 12, 2019	Jan. 01, 2019	Aug. 27, 2015	Jan. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 07, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Proceeds from issuance of common stock					$ 57,000	$ 26,930,000	$ 169,000
Common stock repurchase, authorized	$ 25,000,000
Shares repurchased					0	1,200,000
Common stock, par value (in dollars per share)					$ 0.01	$ 0.01
Shares repurchased, value						$ 19,598,000
Average price per share					$ 16.06
Accumulated Deficit [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares repurchased, value					$ 19,600,000	19,586,000
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock repurchase, authorized								$ 25,000,000
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares repurchased	0
Initial Public Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares resold by shareholders				6,500,000
Newly issued shares of common stock				975,000
Proceeds from issuance of common stock				$ 25,600,000
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value					$ 1,600,000	$ 16,100,000	$ 100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value							$ 7.30
Stock Options Outstanding, Granted					0	0
Cash received from stock options exercised					$ 100,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate					0.00%
Stock Options, Unrecognized Share-based Compensation Expense					$ 2,100,000
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition					1 year
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options, Unrecognized Share-based Compensation Expense					$ 6,300,000
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition					2 years 4 months 24 days
Performance Stock Units (PSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options, Unrecognized Share-based Compensation Expense					$ 2,800,000
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition					1 year 10 months 24 days
2015 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Expiration Term			10 years
Number of Shares Authorized			2,250,000
Number of Shares Annual Increase		1,119,924	1,800,000
Plan Shares Annual Increase, Percentage			4.00%
Maximum Number of Shares Authorized per One Participant			2,000,000		1,280,000