CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance (in shares) at Dec. 31, 2018		19,383,000
Balance at Dec. 31, 2018	$ 136,435	$ 97	$ 144,013	$ (86)	$ (7,589)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under stock plans, net of shares withheld for tax payments (in shares)		9,000
Issuance of shares under stock plans, net of shares withheld for tax payments		$ 1
Stock-based compensation, net of shares withheld for tax payments (in shares)		29,000
Stock-based compensation, net of shares withheld for tax payments	418		418
Unrealized gain (loss) on derivative financial instruments, net of tax	(47)			(47)
Tax payments related to stock-based awards	(157)		(157)
Net income (loss)	(7,364)				(7,364)
Balance (in shares) at Mar. 31, 2019		19,412,000
Balance at Mar. 31, 2019	129,285	$ 97	144,274	(133)	(14,953)
Balance (in shares) at Dec. 31, 2018		19,383,000
Balance at Dec. 31, 2018	136,435	$ 97	144,013	(86)	(7,589)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unrealized gain (loss) on derivative financial instruments, net of tax	(136)
Net income (loss)	(4,754)
Balance (in shares) at Jun. 30, 2019		19,465,000
Balance at Jun. 30, 2019	132,473	$ 97	144,941	(222)	(12,343)
Balance (in shares) at Mar. 31, 2019		19,412,000
Balance at Mar. 31, 2019	129,285	$ 97	144,274	(133)	(14,953)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation, net of shares withheld for tax payments (in shares)		53,000
Stock-based compensation, net of shares withheld for tax payments	835	$ 0	835
Unrealized gain (loss) on derivative financial instruments, net of tax	(89)			(89)
Tax payments related to stock-based awards	(168)		(168)
Net income (loss)	2,610				2,610
Balance (in shares) at Jun. 30, 2019		19,465,000
Balance at Jun. 30, 2019	$ 132,473	$ 97	144,941	(222)	(12,343)
Balance (in shares) at Dec. 31, 2019	19,495,907	19,496,000
Balance at Dec. 31, 2019	$ 125,305	$ 97	145,923	(207)	(20,508)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under stock plans, net of shares withheld for tax payments	93		92
Stock-based compensation, net of shares withheld for tax payments (in shares)		40,000
Stock-based compensation, net of shares withheld for tax payments	447		447
Unrealized gain (loss) on derivative financial instruments, net of tax	(167)			(167)
Tax payments related to stock-based awards	(270)		(270)
Net income (loss)	598				598
Balance (in shares) at Mar. 31, 2020		19,545,000
Balance at Mar. 31, 2020	$ 126,006	$ 98	146,192	(374)	(19,910)
Balance (in shares) at Dec. 31, 2019	19,495,907	19,496,000
Balance at Dec. 31, 2019	$ 125,305	$ 97	145,923	(207)	(20,508)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unrealized gain (loss) on derivative financial instruments, net of tax	(171)
Net income (loss)	$ 1,022
Balance (in shares) at Jun. 30, 2020	19,545,308	19,545,000
Balance at Jun. 30, 2020	$ 126,703	$ 98	146,469	(378)	(19,486)
Balance (in shares) at Mar. 31, 2020		19,545,000
Balance at Mar. 31, 2020	126,006	$ 98	146,192	(374)	(19,910)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation, net of shares withheld for tax payments	277		277
Unrealized gain (loss) on derivative financial instruments, net of tax	(4)			(4)
Net income (loss)	$ 424				424
Balance (in shares) at Jun. 30, 2020	19,545,308	19,545,000
Balance at Jun. 30, 2020	$ 126,703	$ 98	$ 146,469	$ (378)	$ (19,486)