|
Consolidated Balance Sheets (Parenthetical) (USD $)
|
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Preferred stock, par value (in USD per share) | $ 0.001 | $ 0.001 |
| Preferred stock, authorized | 5,000,000 | 5,000,000 |
| Preferred stock, issued | 0 | 0 |
| Preferred stock, outstanding | 0 | 0 |
| Common stock, par value (in USD per share) | $ 0.001 | $ 0.001 |
| Common stock, authorized | 100,000,000 | 100,000,000 |
| Common stock, issued | 56,704,347 | 56,299,022 |
| Common stock, outstanding | 56,704,347 | 56,299,022 |