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Capital Stock (Narrative) (Details) (USD $)
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12 Months Ended | |
|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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| Capital Stock [Abstract] | ||
| Common stock, shares authorized | 600,000,000 | 600,000,000 |
| Common stock, par value | $ 0.001 | $ 0.001 |
| Preferred stock, shares authorized | 10,000,000 | 10,000,000 |
| Preferred stock, par value | $ 0.001 | $ 0.001 |
| Common stock shares outstanding | 172,363,259 | 172,104,720 |
| Reserved for future issuance | 23,824,039 | 22,089,643 |
| Restricted Stock Units, Issued | 2,386,673 | 3,341,132 |
| Unvested Restricted Stock Units | 3,580,009 | 5,011,698 |