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The Company and Summary of Significant Accounting Policies - Summary of Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income (loss)	$ 315	$ (3,994)	$ 663	$ (8,399)
Shares used in computing net income (loss) per share
Basic	8,171	6,677	8,151	6,662
Total shares: basic	8,171	6,677	8,151	6,662
Total shares: diluted	8,409	6,677	8,378	6,662
Net income (loss) per share:
Basic	$ 0.04	$ (0.60)	$ 0.08	$ (1.26)
Diluted	$ 0.04	$ (0.60)	$ 0.08	$ (1.26)
Stock Option [Member]
Shares used in computing net income (loss) per share
Add: weighted-average stock options outstanding	81		72
Unvested Restricted Stock Units [Member]
Shares used in computing net income (loss) per share
Add: weighted-average stock options outstanding	157		155

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