Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock	Treasury Stock	Other Comprehensive Loss	Additional Paid-In Capital	Retained Earnings	Total
Beginning Balance, shares (in shares) at Dec. 31, 2017	28,860,961
Beginning Balance, Treasury stock, shares (in shares) at Dec. 31, 2017		(711,231)
Beginning Balance, amount at Dec. 31, 2017	$ 288	$ (6,540)	$ (26)	$ 174,697	$ 62,847	$ 231,266
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation				334		334
Exercise of stock options (in shares)	146,765
Exercise of stock options	$ 2			814		816
Cash flow hedge, net of tax			269			269
Net income (loss)					4,101	4,101
Ending Balance, shares (in shares) at Mar. 31, 2018	29,007,726
Ending Balance, Treasury stock, shares (in shares) at Mar. 31, 2018		(711,231)
Ending Balance, amount at Mar. 31, 2018	$ 290	$ (6,540)	243	175,845	66,662	236,500
Beginning Balance, shares (in shares) at Dec. 31, 2017	28,860,961
Beginning Balance, Treasury stock, shares (in shares) at Dec. 31, 2017		(711,231)
Beginning Balance, amount at Dec. 31, 2017	$ 288	$ (6,540)	(26)	174,697	62,847	231,266
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						(6)
Ending Balance, shares (in shares) at Sep. 30, 2018	29,677,843
Ending Balance, Treasury stock, shares (in shares) at Sep. 30, 2018		(711,231)
Ending Balance, amount at Sep. 30, 2018	$ 296	$ (6,540)	357	179,214	62,555	235,882
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASC 606 (Note 2) | Accounting Standards Update 2014-09					(286)	(286)
Beginning Balance, shares (in shares) at Mar. 31, 2018	29,007,726
Beginning Balance, Treasury stock, shares (in shares) at Mar. 31, 2018		(711,231)
Beginning Balance, amount at Mar. 31, 2018	$ 290	$ (6,540)	243	175,845	66,662	236,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation				817		817
Exercise of stock options (in shares)	84,705
Exercise of stock options	$ 0			483		483
Issuance of restricted stock (in shares)	331,095
Issuance of restricted stock	$ 3			(3)		0
Cash flow hedge, net of tax			77			77
Forfeiture of restricted stock (in shares)	(1,094)
Net income (loss)					2,249	2,249
Ending Balance, shares (in shares) at Jun. 30, 2018	29,422,432
Ending Balance, Treasury stock, shares (in shares) at Jun. 30, 2018		(711,231)
Ending Balance, amount at Jun. 30, 2018	$ 293	$ (6,540)	320	177,142	68,911	240,126
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation				559		559
Exercise of stock options (in shares)	256,833
Exercise of stock options	$ 3			1,513		1,516
Issuance of restricted stock (in shares)	2,769
Cash flow hedge, net of tax			37			37
Forfeiture of restricted stock (in shares)	(4,191)
Net income (loss)					(6,356)	(6,356)
Ending Balance, shares (in shares) at Sep. 30, 2018	29,677,843
Ending Balance, Treasury stock, shares (in shares) at Sep. 30, 2018		(711,231)
Ending Balance, amount at Sep. 30, 2018	$ 296	$ (6,540)	357	179,214	62,555	$ 235,882
Beginning Balance, shares (in shares) at Dec. 31, 2018	29,611,989					29,611,989
Beginning Balance, Treasury stock, shares (in shares) at Dec. 31, 2018		(711,231)				(711,231)
Beginning Balance, amount at Dec. 31, 2018	$ 296	$ (6,540)	(52)	179,742	(31,861)	$ 141,585
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation				664		664
Exercise of stock options (in shares)	7,021
Exercise of stock options	$ 0			35		35
Issuance of restricted stock (in shares)	185,204
Issuance of restricted stock	$ 1			(1)		0
Cash flow hedge, net of tax			(284)			(284)
Forfeiture of restricted stock (in shares)	(18,207)
Net income (loss)					(7,924)	(7,924)
Ending Balance, shares (in shares) at Mar. 31, 2019	29,786,007
Ending Balance, Treasury stock, shares (in shares) at Mar. 31, 2019		(711,231)
Ending Balance, amount at Mar. 31, 2019	$ 297	$ (6,540)	(336)	180,440	(39,785)	$ 134,076
Beginning Balance, shares (in shares) at Dec. 31, 2018	29,611,989					29,611,989
Beginning Balance, Treasury stock, shares (in shares) at Dec. 31, 2018		(711,231)				(711,231)
Beginning Balance, amount at Dec. 31, 2018	$ 296	$ (6,540)	(52)	179,742	(31,861)	$ 141,585
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						$ (5,518)
Ending Balance, shares (in shares) at Sep. 30, 2019	30,261,584					30,261,584
Ending Balance, Treasury stock, shares (in shares) at Sep. 30, 2019		(711,231)				(711,231)
Ending Balance, amount at Sep. 30, 2019	$ 303	$ (6,540)	(1,270)	182,062	(37,379)	$ 137,176
Beginning Balance, shares (in shares) at Mar. 31, 2019	29,786,007
Beginning Balance, Treasury stock, shares (in shares) at Mar. 31, 2019		(711,231)
Beginning Balance, amount at Mar. 31, 2019	$ 297	$ (6,540)	(336)	180,440	(39,785)	134,076
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation				1,064		1,064
Issuance of restricted stock (in shares)	479,590
Issuance of restricted stock	$ 6			(6)		0
Cash flow hedge, net of tax			(758)			(758)
Forfeiture of restricted stock (in shares)	(50,513)
Forfeiture of restricted stock	$ (1)			1		0
Net income (loss)					(1,633)	(1,633)
Ending Balance, shares (in shares) at Jun. 30, 2019	30,215,084
Ending Balance, Treasury stock, shares (in shares) at Jun. 30, 2019		(711,231)
Ending Balance, amount at Jun. 30, 2019	$ 302	$ (6,540)	(1,094)	181,499	(41,418)	132,749
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation				564		564
Issuance of restricted stock (in shares)	46,500
Issuance of restricted stock	$ 1			(1)
Cash flow hedge, net of tax			(176)			(176)
Net income (loss)					4,039	$ 4,039
Ending Balance, shares (in shares) at Sep. 30, 2019	30,261,584					30,261,584
Ending Balance, Treasury stock, shares (in shares) at Sep. 30, 2019		(711,231)				(711,231)
Ending Balance, amount at Sep. 30, 2019	$ 303	$ (6,540)	$ (1,270)	$ 182,062	$ (37,379)	$ 137,176