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Mezzanine and Stockholders' Equity - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 18, 2018 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |
Repurchase of common shares |  |  | $ 40,000 | $ 0 |
Holdback shares not issued to former shareholders (in shares) |  |  | 480,212 |  |
Stock options exercised (in shares) |  |  | 203,524 | 366,454 |
Options exercised pursuant to cashless exercise provision (in shares) |  |  |  | 60,536 |
Shares issued in cashless exercise provision (in shares) |  |  |  | 47,576 |
Options outstanding term |  |  | 5 years |  |
Warrants exercised (in shares) |  |  | 133,221 | 268,663 |
Proceeds from warrants exercised |  |  | $ 1,200,000 | $ 2,100,000 |
Treasury shares (in shares) |  | 16,959,069 | 16,959,069 |  | 1,850,603
Minimum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exercise price of exercises during period (in dollars per share) |  | $ 1.5 | $ 1.5 | $ 0.01 |
Exercise price of warrants (in dollars per share) |  |  | 9.00 | 4.00 |
Maximum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exercise price of exercises during period (in dollars per share) |  | $ 10 | 10 | 10 |
Exercise price of warrants (in dollars per share) |  |  | $ 11.00 | $ 11.00 |
Allied Pacific of California |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Repurchase of common shares | $ 1,700,000 |  |  |  |
Shares repurchased (in shares) | 1,662,571 |  |  |  |
Treasury shares (in shares) |  | 16,790,576 | 16,790,576 |  | 1,682,110
Purchase of treasury shares (in shares) |  |  | 15,015,015 |  |
CDSC |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends paid |  |  | $ 1,200,000 |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Share-based compensation |  | $ 100,000 | $ 400,000 |  |
Restricted Stock Awards |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Restricted stock awards granted (in shares) |  | 117,766 | 117,766 |  |
Grant date fair value of restricted stock to be recognized straight-line |  | $ 2,100,000 | $ 2,100,000 |  |
Award vesting period |  |  | 3 years |  |
APC Stock Option |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Proceeds of options exercised |  |  | $ 1,200,000 | $ 1,500,000 |
Board Members |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Options granted (in shares) |  |  | 45,000 |  |
Options outstanding exercise price (in dollars per share) |  | $ 18.11 | $ 18.11 |  |
Executives |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Options granted (in shares) |  |  | 78,378 |  |
Options outstanding exercise price (in dollars per share) |  | $ 17.62 | $ 17.62 |  |
APCN share Holder |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Purchase of treasury shares (in shares) |  |  |  |  | 168,493
APC Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends paid |  |  | $ 59,700,000 | $ 2,000,000 |
Holdback Shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury shares (in shares) |  | 93,451 | 93,451 |  |

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