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