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Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 Inducement grant options | Jun. 30, 2012 Inducement grant options | Mar. 31, 2012 Inducement grant options | Sep. 30, 2012 Plans Options | Jun. 30, 2012 Plans Options | Mar. 31, 2012 Plans Options
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 0.9 | $ 0.9 | $ 3.0 | $ 2.5 |  |  |  |  |  |
Unamortized compensation cost, net of expected forfeitures | $ 5.7 |  | $ 5.7 |  |  |  |  |  |  |
Weighted average period for recognition of unamortized compensation cost |  |  | 2 years 8 months 26 days |  |  |  |  |  |  |
Available for Grant |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  |  |  |  |  |  | 2,225,000 | 2,529,000 | 1,977,000
Additional shares authorized under the 2010 Plan |  |  |  |  |  |  |  |  |  | 500,000
Options granted (in shares) |  |  |  |  |  |  |  | (1,338,000) | (430,000) | (4,000)
Options cancelled (in shares) |  |  |  |  |  |  |  | 356,000 | 361,000 | 111,000
Options expired (in shares) |  |  |  |  |  |  |  | (209,000) | (235,000) | (55,000)
Balance at the end of the period (in shares) |  |  |  |  |  |  |  | 1,034,000 | 2,225,000 | 2,529,000
Number of Shares |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  |  |  | 4,314,000 | 4,951,000 | 4,815,000 | 6,436,000 | 6,387,000 | 6,528,000
Options granted (in shares) |  |  |  |  |  |  | 350,000 | 1,338,000 | 430,000 | 4,000
Options cancelled (in shares) |  |  |  |  | (248,000) | (199,000) | (103,000) | (356,000) | (361,000) | (111,000)
Options exercised (in shares) |  |  |  |  | (597,000) | (438,000) | (111,000) | (78,000) | (20,000) | (34,000)
Balance at the end of the period (in shares) |  |  |  |  | 3,469,000 | 4,314,000 | 4,951,000 | 7,340,000 | 6,436,000 | 6,387,000
Weighted Average Exercise Prices |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in dollars per share) |  |  |  |  | $ 3.69 | $ 3.41 | $ 3.29 | $ 4.30 | $ 4.50 | $ 4.48
Options granted (in dollars per share) |  |  |  |  |  |  | $ 3.92 | $ 3.23 | $ 3.23 | $ 3.93
Options cancelled (in dollars per share) |  |  |  |  | $ 1.55 | $ 1.55 | $ 1.54 | $ 5.77 | $ 6.70 | $ 4.23
Options exercised (in dollars per share) |  |  |  |  | $ 1.55 | $ 1.55 | $ 1.54 | $ 2.29 | $ 1.98 | $ 2.85
Balance at the end of the period (in dollars per share) |  |  |  |  | $ 4.21 | $ 3.69 | $ 3.41 | $ 4.04 | $ 4.30 | $ 4.50

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