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 |