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Mezzanine and Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |  |  |
Holdback shares not issued to former shareholders (in shares) |  |  | 302,732 |  |
Stock options exercised (in shares) |  |  | 120,000 | 203,524 |
Options exercised (in shares) |  |  | 0 | 0 |
Options outstanding exercise price (in dollars per share) | $ 10.86 | $ 10.86 | $ 10.86 |  | $ 9.22
Share-based compensation |  |  | $ 2,558 | $ 1,006 |
Warrants exercised (in shares) |  |  | 800,709 | 133,221 |
Proceeds from warrants exercised |  |  | $ 6,200 | $ 1,200 |
Warrants exercised, cashless exercise provision (in shares) |  |  | 127,022 |  |
Shares issued for exercise of cashless warrants (in shares) |  |  | 66,517 |  |
Treasury shares (in shares) | 17,475,707 | 17,475,707 | 17,475,707 |  | 17,458,810
Allied Pacific of California Brokerage Account |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury stock, value | $ 7,600 | $ 7,600 | $ 7,600 |  |
APC |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury shares (in shares) | 17,307,214 | 17,307,214 | 17,307,214 |  | 17,290,317
Dividends paid | $ 5,000 |  | $ 49,500 | 59,700 |
CDSC |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends paid |  |  | $ 600 | $ 1,200 |
Restricted stock awards |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Restricted stock awards granted (in shares) |  |  | 97,447 |  |
Weighted average grant date fair value (in dollars per share) |  |  | $ 17.58 |  |
Grant date fair value of restricted stock to be recognized straight-line | 1,600 | $ 1,600 | $ 1,600 |  |
Share-based compensation |  | 600 | 2,200 |  |
Unrecognized compensation expense | $ 3,100 | $ 3,100 | $ 3,100 |  |
Minimum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exercise price of exercises during period (in dollars per share) | $ 2.10 | $ 2.10 | $ 2.10 | $ 1.50 |
Exercise price of warrants exercised (in dollars per share) |  |  | 9.00 | 9.00 |
Maximum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exercise price of exercises during period (in dollars per share) | 5.00 | 5.00 | 5.00 | 10.00 |
Exercise price of warrants exercised (in dollars per share) |  |  | $ 11.00 | $ 11.00 |
APC Stock Option |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Proceeds of options exercised |  |  | $ 300 | $ 1,200 |
Board Members |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Options granted (in shares) |  |  | 11,742 |  |
Options outstanding exercise price (in dollars per share) | $ 18.41 | $ 18.41 | $ 18.41 |  |
Board Members | Stock options |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Vesting period |  |  | 5 years |  |

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