Organization and Summary of Significant Accounting Policies, Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Earnings (loss) per share [Abstract]
Net loss	[1]	$ (1,526)	$ (15,956)
Basic [Abstract]
Weighted-average shares of common stock outstanding (in shares)		18,644,000	18,409,000
Shares used in computing basic net loss per share (in shares)		18,644,000	18,409,000
Basic net loss per share (in dollars per share)		$ (0.08)	$ (0.87)
Diluted [Abstract]
Weighted-average shares of common stock outstanding (in shares)		18,644,000	18,409,000
Add: Common equivalent shares outstanding (in shares)		0	0
Shares used in computing diluted net loss per share (in shares)		18,644,000	18,409,000
Diluted net loss per share (in dollars per share)		$ (0.08)	$ (0.87)
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average shares excluded from computation of diluted earnings (loss) per share due to exercise prices above average market value (in shares)		1,900,000	1,400,000
Options and Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computation of diluted earnings (loss) per share (in shares)		28,000	23,000

[1] Prior periods adjusted to reflect the impact of the one-for-three reverse stock split that became effective on January 20, 2017, as discussed in Note 1.