Significant Accounting Policies, Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings (loss) per share [Abstract]
Net Income (loss)	$ 231	$ (2,129)	$ (1,220)	$ (12,467)
Basic [Abstract]
Weighted-average shares of common stock outstanding (in shares)	18,692	18,446	18,613	18,372
Shares used in computing basic income (loss) per share (in shares)	18,692	18,446	18,613	18,372
Basic income (loss) per share (in dollars per share)	$ 0.01	$ (0.12)	$ (0.07)	$ (0.69)
Diluted [Abstract]
Weighted-average shares of common stock outstanding (in shares)	18,692	18,446	18,613	18,372
Add: Common equivalent shares outstanding (in shares)	22	0	0	0
Shares used in computing diluted income (loss) per share (in shares)	18,714	18,446	18,613	18,372
Diluted income (loss) per share (in dollars per share)	$ 0.01	$ (0.12)	$ (0.07)	$ (0.69)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares outstanding excluded from computation of diluted loss per share (in shares)			417	6,174
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares outstanding excluded from computation of diluted loss per share (in shares)			417	4,475
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares outstanding excluded from computation of diluted loss per share (in shares)			0	1,375
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares outstanding excluded from computation of diluted loss per share (in shares)			0	324

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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