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Stock-Based Compensation (Details) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Options | Jun. 30, 2013 Options | Jun. 30, 2014 Options | Jun. 30, 2013 Options | Jun. 30, 2014 RSU's | Jun. 30, 2014 RSU's Minimum | Jun. 30, 2014 RSU's Maximum | Jun. 30, 2014 Inducement grant options | Mar. 31, 2014 Inducement grant options | Jun. 30, 2014 Plans Options | Mar. 31, 2014 Plans Options | Jun. 30, 2014 Plans RSU's | Mar. 31, 2014 Plans RSU's
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 1,000,000 | $ 1,000,000 | $ 2,500,000 | $ 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized compensation cost, net of expected forfeitures |  |  |  |  | 4,500,000 |  | 4,500,000 |  |  |  |  |  |  |  |  |  |
Weighted average expected period over which the expense is to be recognized |  |  |  |  |  |  | 2 years 2 months 26 days |  | 2 years 8 months 16 days |  |  |  |  |  |  |  |
Stock-based compensation expense, recognition period |  |  |  |  |  |  |  |  |  | 3 years | 5 years |  |  |  |  |  |
Unamortized compensation cost for awards other than options, net of expected forfeitures |  |  |  |  |  |  |  |  | 1,300,000 |  |  |  |  |  |  |  |
Tax benefits associated with exercise of stock options |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |
Available for Grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 374,000 | 422,000 |  |
Additional shares authorized under the Amended 2010 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 | 500,000 |  |
Restricted stock units granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,000) | (499,000)
Options granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (49,000) |  |
Options cancelled (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000 | 60,000 |  |
Options expired (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,000) | (60,000) |  |
Balance at the end of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,865,000 | 374,000 |  |
Number of Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 3,224,000 | 3,178,000 | 6,416,000 | 6,727,000 |  |
Options granted (in shares) |  |  |  |  |  |  |  |  |  |  |  | 125,000 | 118,000 |  | 49,000 |  |
Options cancelled (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | (40,000) | (4,000) | (60,000) |  |
Options exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  | (20,000) | (32,000) | (52,000) | (300,000) |  |
Balance at the end of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 3,329,000 | 3,224,000 | 6,360,000 | 6,416,000 |  |
Weighted Average Exercise Prices |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 4.46 | $ 4.42 | $ 3.89 | $ 3.86 |  |
Options granted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 3.87 | $ 5.22 |  | $ 4.69 |  |
Options cancelled (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.47 | $ 5.21 | $ 3.42 |  |
Options exercised (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 1.55 | $ 3.88 | $ 1.61 | $ 3.58 |  |
Options expired (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.21 | $ 3.42 |  |
Balance at the end of the period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 4.45 | $ 4.46 | $ 3.91 | $ 3.89 |  |

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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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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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