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Stock-Based Compensation (Details) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Stock-Based Compensation |  |
Stock-based compensation expense | $ 1,500,000 | $ 900,000
Options |  |
Stock-Based Compensation |  |
Unamortized compensation cost, net of expected forfeitures | 5,100,000 |
Weighted average expected period over which the expense is to be recognized | 2 years 4 months 17 days |
Tax benefits associated with exercise of stock options | 0 | 0
RSU's |  |
Stock-Based Compensation |  |
Weighted average expected period over which the expense is to be recognized | 2 years 11 months 12 days |
Unamortized compensation cost for awards other than options, net of expected forfeitures | $ 1,500,000 |
RSU's | Minimum |  |
Stock-Based Compensation |  |
Stock-based compensation expense, recognition period | 3 years |
RSU's | Maximum |  |
Stock-Based Compensation |  |
Stock-based compensation expense, recognition period | 5 years |
Inducement grant options |  |
Number of Shares |  |
Balance at the beginning of the period (in shares) | 3,178,000 |
Options granted (in shares) | 118,000 |
Options cancelled (in shares) | (40,000) |
Options exercised (in shares) | (32,000) |
Balance at the end of the period (in shares) | 3,224,000 |
Weighted Average Exercise Prices |  |
Balance at the beginning of the period (in dollars per share) | $ 4.42 |
Options granted (in dollars per share) | $ 5.22 |
Options cancelled (in dollars per share) | $ 4.47 |
Options exercised (in dollars per share) | $ 3.88 |
Balance at the end of the period (in dollars per share) | $ 4.46 |
Plans | Options |  |
Available for Grant |  |
Balance at the beginning of the period (in shares) | 422,000 |
Additional shares authorized under the 2010 Plan | 500,000 |
Options granted (in shares) | (49,000) |
Options cancelled (in shares) | 60,000 |
Options expired (in shares) | (60,000) |
Balance at the end of the period (in shares) | 374,000 |
Number of Shares |  |
Balance at the beginning of the period (in shares) | 6,727,000 |
Options granted (in shares) | 49,000 |
Options cancelled (in shares) | (60,000) |
Options exercised (in shares) | (300,000) |
Balance at the end of the period (in shares) | 6,416,000 |
Weighted Average Exercise Prices |  |
Balance at the beginning of the period (in dollars per share) | $ 3.86 |
Options granted (in dollars per share) | $ 4.69 |
Options cancelled (in dollars per share) | $ 3.42 |
Options exercised (in dollars per share) | $ 3.58 |
Options expired (in dollars per share) | $ 3.42 |
Balance at the end of the period (in dollars per share) | $ 3.89 |
Plans | RSU's |  |
Available for Grant |  |
Restricted stock units granted (in shares) | (499,000) |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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