Stockholders' Equity and Employee Stock Option Plans (Details Textual) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 22, 2016 right $ / shares shares	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) shares	Jun. 30, 2015 USD ($)
Stockholders' Equity and Employee Stock Option Plans [Abstract]
Rights issued as common stock dividend (in right) | right	1
Number of shares available to purchase for each right (usd per share)	0.0010
Preferred stock, par value (usd per share) | $ / shares	$ 0.01
Beneficial ownership percentage excluded from exercise of rights	4.99%
Stockholders' Equity and Employee Stock Option Plans (Textual) [Abstract]
Options exercised (in shares)				0
Total fair value of RSUs vested and released | $		$ 92	$ 72	$ 96	$ 316