Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]
BALANCE at Dec. 31, 2014	$ 37,438	$ 30,145	$ (1,271)	$ 8,564
BALANCE, shares at Dec. 31, 2014		6,644
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options, vesting of restricted stock units, net of shares exchanged as payment	458	$ 458
Exercise of stock options, vesting of restricted stock units, net of shares exchanged as payment, shares		88
Share issuances for compensation purposes	41	$ 41
Share issuances for compensation purposes, shares		4
Stock-based compensation	470	$ 470
Issuance of common stock under Employee Stock Purchase Plan	178	$ 178
Issuance of common stock under Employee Stock Purchase Plan, shares		36
Other comprehensive income (loss), net of tax	(438)		(438)
Net income (loss)	(2,089)			(2,089)
BALANCE at Dec. 31, 2015	36,058	$ 31,292	(1,709)	6,475
BALANCE, shares at Dec. 31, 2015		6,772
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options, vesting of restricted stock units, net of shares exchanged as payment	474	$ 474
Exercise of stock options, vesting of restricted stock units, net of shares exchanged as payment, shares		86
Tax payments related to shares withheld for share-based compensation plans	(9)	$ (9)
Share issuances for compensation purposes	136	$ 136
Share issuances for compensation purposes, shares		8
Stock-based compensation	727	$ 727
Issuance of common stock under Employee Stock Purchase Plan	181	$ 181
Issuance of common stock under Employee Stock Purchase Plan, shares		36
Other comprehensive income (loss), net of tax	(231)		(231)
Net income (loss)	11,562			11,562
BALANCE at Dec. 31, 2016	48,898	$ 32,801	(1,940)	18,037
BALANCE, shares at Dec. 31, 2016		6,902
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase related to adoption of ASU 2016-09	285	$ 23		262
Exercise of stock options, vesting of restricted stock units, net of shares exchanged as payment	378	$ 378
Exercise of stock options, vesting of restricted stock units, net of shares exchanged as payment, shares		73
Tax payments related to shares withheld for share-based compensation plans	(35)	$ (35)
Tax payments related to shares withheld for share-based compensation plans, shares		(7)
Share issuances for compensation purposes		$ 0
Share issuances for compensation purposes, shares		8
Stock-based compensation	895	$ 895
Issuance of common stock under Employee Stock Purchase Plan	258	$ 258
Issuance of common stock under Employee Stock Purchase Plan, shares		19
Repurchase of common stock	(240)	$ (240)
Repurchase of common stock, Shares		(15)
Other comprehensive income (loss), net of tax	531		531
Net income (loss)	1,312			1,312
BALANCE at Dec. 31, 2017	$ 52,282	$ 34,080	$ (1,409)	$ 19,611
BALANCE, shares at Dec. 31, 2017		6,980