Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation (Details)

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Stock Based Compensation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Stock-based compensation [Line Items]        
Stock-based compensation expense included in operating expense $ 904,000 $ 192,000 $ 1,128,000 $ 987,000
Directors and Employee [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted (in shares) 1,350,000 210,000 1,360,000 210,000
Research and Development [Member]        
Stock-based compensation [Line Items]        
Stock-based compensation expense included in operating expense $ 86,000 $ 18,000 $ 104,000 $ 95,000
Selling, General and Administrative [Member]        
Stock-based compensation [Line Items]        
Stock-based compensation expense included in operating expense $ 818,000 $ 174,000 $ 1,024,000 $ 892,000
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted (in shares) 1,695,000 0 1,815,000 0