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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 |  |  |

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