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1. Summary of Significant Accounting Policies (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Stock based compensation costs $ 1,400 $ 1,100 $ 3,609 $ 2,578
Unrecognized stock-based compensation costs 15,200   $ 15,200  
Unrecognized stock-based compensation costs amortization period     2 years 9 months 18 days  
Aggregate intrinsic value outstanding 16,400   $ 16,400  
Aggregate intrinsic value exercisable $ 14,200   $ 14,200  
Options Exercised     1,033,000 1,168,000
Total intrinsic value of options exercised     $ 7,100 $ 10,600
Shares available for future grants 5,500,000   5,500,000  
Repurchase of common stock, shares repurchased     544,521 73,788
Repurchase of common stock average share price     $ 6.21 $ 7.91
Shares issued for conversion of options and warrants     392,200 395,000
Proceeds from exercise of options and warrants     $ 535 $ 583
Purchased in Open Market        
Repurchase of common stock, shares repurchased     468,948  
Repurchase of common stock average share price     $ 6.07  
Net Exercises of outstanding options and warrants        
Repurchase of common stock, shares repurchased     75,573 73,788