Net Income (Loss) per Share of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator for earnings per share:
Net loss that is available to common shareholders	$ (4,959)	$ (78,815)	$ (3,932)	$ (86,217)
Denominator for basic earnings per share:
Weighted average shares outstanding	22,222,827	22,075,318	22,162,237	22,015,008
Denominator for diluted earnings per share:
Effect of stock options and restricted stock units	0	0	0	0
Adjusted weighted average shares and assumed conversions	22,222,827	22,075,318	22,162,237	22,015,008
Basic loss per share	$ (0.22)	$ (3.57)	$ (0.18)	$ (3.92)
Diluted loss per share	$ (0.22)	$ (3.57)	$ (0.18)	$ (3.92)
Net loss position (excluded from denominator)
Shares excluded from diluted earnings (loss) per share due to:
Antidilutive securities excluded from computation of earnings per share	384,885	63,488	164,378	92,051
Inclusion would have been anti-dilutive (excluded from calculation)
Shares excluded from diluted earnings (loss) per share due to:
Antidilutive securities excluded from computation of earnings per share	563,903	893,198	669,496	780,062