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Stock-Based Compensation Arrangements (Details 3) (USD $) | 12 Months Ended | 197 Months Ended |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 | May 23, 2012
Stock-based compensation |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  | 10,000,000
Number of shares reserved for issuance before amendment |  |  |  |  | 5,200,000
Vesting period | 4 years |  |  |  |
Compensation cost | $ 380,000 | $ 882,000 | $ 1,746,000 |  |
Cash proceeds | 94,000 | 3,000 |  | 267,000 |
Number of options outstanding |  |  |  |  |
Exercised (in shares) | (33,351) | (948) |  |  |
Stock options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Expiration period | 10 years |  |  |  |
Vesting period | 4 years |  |  |  |
Weighted average grant-date fair value (in dollars per share) | $ 2.52 | $ 8.05 | $ 9.80 |  |
Total remaining unrecognized compensation cost | 400,000 |  |  | 400,000 |
Weighted-average remaining requisite service period of recognition of unrecognized compensation cost | 2 years 3 months 7 days |  |  |  |
Cash proceeds | 100,000 | 3,000 | 100,000 |  |
Total intrinsic value of options exercised | 100,000 | 7,000 | 200,000 |  |
Income tax benefits recorded for share based payments | 0 | 0 | 0 |  |
Number of options outstanding |  |  |  |  |
Options outstanding at the beginning of the period (in shares) | 502,249 | 498,562 |  |  |
Granted (in shares) | 33,571 | 28,500 |  |  |
Exercised (in shares) | (33,351) | (948) | (24,901) |  |
Cancelled / forfeited (in shares) | (39,446) | (23,865) |  |  |
Options outstanding at the end of the period (in shares) | 463,023 | 502,249 | 498,562 | 463,023 |
Unvested at the end of the period (in shares) | 69,781 |  |  | 69,781 |
Vested and exercisable at the end of the period (in shares) | 393,242 |  |  | 393,242 |
Weighted average exercise price |  |  |  |  |
Options outstanding at the beginning of the period (in dollars per share) | $ 26.11 | $ 27.72 |  |  |
Granted (in dollars per share) | $ 3.29 | $ 10.64 |  |  |
Exercised (in dollars per share) | $ 3.09 | $ 2.87 |  |  |
Cancelled / forfeited (in dollars per share) | $ 20.21 | $ 40.53 |  |  |
Options outstanding at the end of the period (in dollars per share) | $ 26.61 | $ 26.11 | $ 27.72 | $ 26.61 |
Unvested at the end of the period (in dollars per share) | $ 8.83 |  |  | $ 8.83 |
Vested and exercisable at the end of the period (in dollars per share) | $ 29.77 |  |  | $ 29.77 |
Weighted average remaining contractual term |  |  |  |  |
Options outstanding | 5 years 6 months 29 days | 6 years 5 months 8 days | 7 years 2 months 19 days |  |
Unvested at the end of the period | 8 years 5 months 8 days |  |  |  |
Vested and exercisable at the end of the period | 5 years 25 days |  |  |  |
Aggregate intrinsic value |  |  |  |  |
Options outstanding | 347 | 140 | 938 | 347 |
Unvested at the end of the period | 68 |  |  | 68 |
Vested and exercisable at the end of the period | 279 |  |  | 279 |
Stock options | Employees and directors |  |  |  |  |
Stock-based compensation |  |  |  |  |
Grant date fair value | 100,000 | 200,000 | 600,000 |  |
Compensation cost | $ 12,000 | $ 24,000 | $ 50,000 |  |
Weighted average grant-date fair value (in dollars per share) | $ 2.52 | $ 8.05 | $ 9.80 |  |
Number of options outstanding |  |  |  |  |
Granted (in shares) | 33,571 | 28,500 | 100,000 |  |

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