Share-Based Compensation - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Repurchase of common stock for employee tax withholding obligations amount	$ 1,062	$ 3,019
Recognition period of unrecognized cost	2 years 6 months
Requisite service period	3 years
Total unrecognized compensation cost related to non-vested stock option awards	$ 1,600
Granted	204,150		0
Minimum
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share based compensation arrangement performance period	1 year 4 months 24 days
Maximum
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share based compensation arrangement performance period	3 years 4 months 24 days
2017 Plan
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Useful Term of the plan	10 years
Common stock shares issuable	1,750,000
Shares available for grant	1,077,197
2007 Plan
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Award vesting period	3 years
2007 Plan | Performance Unit Incentive Plan ("PUP")
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Shares available for grant	0
Awards with grant date fair value during the period	$ 4,800
Stock value payable	1,800
Liability awards recorded	400		$ 5,300
Payments to employees	2,600		5,600
Paid to employees as shares			$ 3,400
Repurchase of common stock for employee tax withholding obligations amount, shares			25,771
Repurchase of common stock for employee tax withholding obligations amount			$ 1,500
2007 Plan | Restricted Stock Awards And Restricted Stock Units
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Payments to employees	200	300
Paid to employees as shares	$ 800	$ 200
Repurchase of common stock for employee tax withholding obligations amount, shares	17,961	24,586
Repurchase of common stock for employee tax withholding obligations amount	$ 1,100	$ 1,400
Unamortized cost	$ 2,600
Recognition period of unrecognized cost	1 year 2 months 12 days
Liabilities related to restricted stock	$ 800		$ 400