Income Taxes - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Dec. 22, 2017	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 16, 2014
Operating Loss Carryforwards [Line Items]
Profit (loss) from operations		$ 9,210	$ 3,097	$ (20,200)	$ (3,358)	$ 5,995	$ (1,336)	$ (4,246)	$ (4,322)	$ (11,251)	$ (3,909)	$ (14,984)
Projected annual limitation on the use of the net operating losses that existed prior to September 17, 2014													$ 800
Increase (decrease) in valuation allowance										4,100	1,700
Change in valuation allowance										$ 4,056	1,688	$ (5,445)
Tax Cuts and Jobs Act of 2017, incomplete accounting, change in tax rate, deferred tax asset, provisional income tax expense	$ 11,700
Federal | Internal Revenue Service
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards						42,200					42,200
Profit (loss) from operations											(1,500)
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards						$ 24,500					$ 24,500