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Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 Inducement grant options | Mar. 31, 2012 Inducement grant options | Jun. 30, 2012 Plans Options | Mar. 31, 2012 Plans Options | Jun. 30, 2012 Plans Restricted stock awards and restricted stock unit | Mar. 31, 2012 Plans Restricted stock awards and restricted stock unit
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 1.0 | $ 0.8 | $ 2.1 | $ 1.6 |  |  |  |  |  |
Unamortized compensation cost, net of expected forfeitures | $ 5.0 |  | $ 5.0 |  |  |  |  |  |  |
Weighted average period for recognition of unamortized compensation cost |  |  | 2 years 5 months 19 days |  |  |  |  |  |  |
Available for Grant |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  |  |  |  |  | 2,529,000 | 1,977,000 |  |
Additional shares authorized under the 2010 Plan |  |  |  |  |  |  |  | 500,000 |  |
Options granted (in shares) |  |  |  |  |  |  | (430,000) | (4,000) |  |
Options cancelled (in shares) |  |  |  |  |  |  | 361,000 | 111,000 |  |
Options expired (in shares) |  |  |  |  |  |  | (235,000) | (55,000) |  |
Balance at the end of the period (in shares) |  |  |  |  |  |  | 2,225,000 | 2,529,000 |  |
Number of Shares |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  |  |  | 4,951,000 | 4,815,000 | 6,387,000 | 6,528,000 |  |
Options granted (in shares) |  |  |  |  |  | 350,000 | 430,000 | 4,000 |  |
Options cancelled (in shares) |  |  |  |  | (199,000) | (103,000) | (361,000) | (111,000) |  |
Options exercised (in shares) |  |  |  |  | (438,000) | (111,000) | (20,000) | (34,000) |  |
Balance at the end of the period (in shares) |  |  |  |  | 4,314,000 | 4,951,000 | 6,436,000 | 6,387,000 |  |
Weighted Average Exercise Prices |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in dollars per share) |  |  |  |  | $ 3.41 | $ 3.29 | $ 4.50 | $ 4.48 |  |
Options granted (in dollars per share) |  |  |  |  |  | $ 3.92 | $ 3.23 | $ 3.93 |  |
Options cancelled (in dollars per share) |  |  |  |  | $ 1.55 | $ 1.54 | $ 6.70 | $ 4.23 |  |
Options exercised (in dollars per share) |  |  |  |  | $ 1.55 | $ 1.54 | $ 1.98 | $ 2.85 |  |
Balance at the end of the period (in dollars per share) |  |  |  |  | $ 3.69 | $ 3.41 | $ 4.30 | $ 4.50 |  |
Number of Shares |  |  |  |  |  |  |  |  |  |
Non-vested shares at the beginning of the period |  |  |  |  |  |  |  |  | 15,000 | 15,000
Vested (in shares) |  |  |  |  |  |  |  |  | (11,000) |
Cancelled (in shares) |  |  |  |  |  |  |  |  | (4,000) |
Non-vested shares at the end of the period |  |  |  |  |  |  |  |  |  | 15,000
Weighted Average Grant-Date Fair Value |  |  |  |  |  |  |  |  |  |
Non-vested shares at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.60 | $ 1.60
Vested (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.62 |
Cancelled (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.55 |
Non-vested shares at the end of the period (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.60

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