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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Stock-based compensation
Unrecognized compensation cost	$ 1,800		$ 1,800
Market-based awards and service-based awards \| Senior Management
Stock-based compensation
Stock based compensation reversed		$ 1,900
RSUs
Stock-based compensation
Unrecognized compensation cost	733		733
RSAs
Stock-based compensation
Unrecognized compensation cost	1,067		1,067
General and administrative
Stock-based compensation
Total stock-based compensation expense	$ 489	$ (874)	$ 1,568	$ 2,747