Stockholders' Equity - Changes in Stockholder's Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 128,688	$ 109,596
Beginning balance (in shares)	30,801,255
Share-based compensation expense	$ 862
Share-based compensation expense		761
Cumulative effect of adoption of Topic 842			$ (72)
Total comprehensive loss	$ (32,624)	9,780
Ending balance (in shares)	30,847,269
Ending balance	$ 96,926	120,065
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 323	$ 318
Beginning balance (in shares)	30,801,000	30,513,000
Share-based compensation expense (in shares)	46,000
Ending balance (in shares)	30,847,000	30,513,000
Ending balance	$ 323	$ 318
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(11,230)	(10,245)
Ending balance	(11,230)	(10,245)
Additional Paid In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	245,852	243,007
Share-based compensation expense	862
Share-based compensation expense		761
Ending balance	246,714	243,768
Retained Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(60,307)	(76,013)
Cumulative effect of adoption of Topic 842			$ (72)
Total comprehensive loss	(24,594)	9,986
Ending balance	(84,901)	(66,099)
Accumulated Other Comp. Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(45,950)	(47,471)
Total comprehensive loss	(8,030)	(206)
Ending balance	$ (53,980)	$ (47,677)