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