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Stockholders' Equity and Employee Stock Option Plans (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Apr. 22, 2016
Stockholders' Equity and Employee Stock Option Plans [Abstract]      
Number of shares available to purchase for each right (usd per share)     0.0010
Stockholders' Equity and Employee Stock Option Plans (Textual) [Abstract]      
Options exercised (in shares) 0    
Total fair value of RSUs vested and released $ 49 $ 4