Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Additional Paid-In Capital	Retained Earnings Cumulative Effect Period of Adoption Adjustment	Retained Earnings	Cumulative Effect Period of Adoption Adjustment	Total
Beginning balance, shares at Dec. 31, 2017	28,860,961
Beginning balance (Accounting Standards Update 2014-09) at Dec. 31, 2017					$ (286)		$ (286)
Beginning balance at Dec. 31, 2017	$ 288	$ (6,540)	$ (26)	$ 174,697		$ 62,847		$ 231,266
Beginning treasury stock, shares at Dec. 31, 2017		(711,231)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation				2,238				$ 2,238
Exercise of stock options, shares	488,303							488,303
Exercise of stock options	$ 5			2,810				$ 2,815
Issue restricted stock, shares	333,864
Issuance of restricted stock	$ 3			(3)
Forfeiture of restricted stock (in shares)	(71,139)
Cash flow hedge			(26)					(26)
Net income (loss)						(94,422)		(94,422)
Ending balance, shares at Dec. 31, 2018	29,611,989
Ending treasury stock, shares at Dec. 31, 2018		(711,231)
Ending balance at Dec. 31, 2018	$ 296	$ (6,540)	(52)	179,742		(31,861)		141,585
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation				2,753				$ 2,753
Exercise of stock options, shares	7,021							7,021
Exercise of stock options				35				$ 35
Issue restricted stock, shares	757,012
Issuance of restricted stock	$ 8			(8)
Forfeiture of restricted stock (in shares)	(72,627)
Forfeiture of restricted stock	$ (1)			1
Cash flow hedge			(993)					(993)
Net income (loss)						(5,359)		$ (5,359)
Ending balance, shares at Dec. 31, 2019	30,303,395							30,303,395
Ending treasury stock, shares at Dec. 31, 2019		(711,231)						(711,231)
Ending balance at Dec. 31, 2019	$ 303	$ (6,540)	(1,045)	182,523		(37,220)		$ 138,021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation				1,998				$ 1,998
Exercise of stock options, shares								0
Issue restricted stock, shares	1,038,044
Issuance of restricted stock	$ 10			(10)
Forfeiture of restricted stock (in shares)	(107,383)
Purchase of vested stock-based awards, shares	(62,252)
Purchase of vested stock-based awards	$ (1)			(187)				$ (188)
Cash flow hedge			(557)					(557)
Net income (loss)						20,220		$ 20,220
Ending balance, shares at Dec. 31, 2020	31,171,804							31,171,804
Ending treasury stock, shares at Dec. 31, 2020		(711,231)						(711,231)
Ending balance at Dec. 31, 2020	$ 312	$ (6,540)	$ (1,602)	$ 184,324		$ (17,000)		$ 159,494