Quarterly report pursuant to Section 13 or 15(d)

Stock-based compensation (Details Narrative)

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Stock-based compensation (Details Narrative) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Option, value per share $ 1.14   $ 1.14   $ .16
Employee stock-based compensation expense $ 1,218,000 $ 1,311,000 $ 9,000 $ 20,000  
Unrecognized compensation expense $ 3,158,000   $ 3,158,000    
Weighted average period     2 years 9 months 18 days   4 years 2 months 12 days
Options outstanding under plan 23,413,880   23,413,880   19,600,112
Options outstanding, value $ 20,675,000   $ 20,675,000   $ 18,061,000
2015 Plan [Member]          
Shares authorized for issuance under equity incentive plan 81,157,135   81,157,135    
2007 Plan [Member]          
Shares available for future issuance 31,157,135   31,157,135    
Equity Incentive Plans [Member]          
Options outstanding under plan 23,413,880   23,413,880    
Shares available for future issuance 78,887,135   78,887,135