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Stockholders' Equity, Equity Incentive Plans and Warrants (Summary of Restricted Stock Awards Activity) (Details) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Options outstanding, number of shares | 9,850,498 | 8,952,129 | |
| Options outstanding, weighted average exercise price | $ 2.58 | $ 2.93 | |
| Options granted (in shares) | 2,331,500 | ||
| Options granted, weighted average exercise price | $ 1.05 | $ 0.89 | $ 1.78 |
| Options forfeited (in shares) | (268,985) | ||
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Restricted Stock [Member]
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| Options outstanding, number of shares | 655,402 | ||
| Options outstanding, weighted average exercise price | $ 1.73 | $ 2.16 | |
| Options granted (in shares) | 30,000 | ||
| Options granted, weighted average exercise price | $ 1.74 | ||
| Options vested (in shares) | (567,268) | ||
| Options vested, weighted average exercise price | $ 2.22 | ||
| Options forfeited (in shares) | (25,323) | ||
| Options forfeited, weighted average exercise price | $ 1.84 | ||
| Options outstanding and unvested (in shares) | 92,811 | ||