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Stock-Based Compensation (Details) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Options | Sep. 30, 2013 Options | Sep. 30, 2014 Options | Sep. 30, 2013 Options | Sep. 30, 2014 Inducement grant options | Jun. 30, 2014 Inducement grant options | Mar. 31, 2014 Inducement grant options | Sep. 30, 2014 RSU's | Sep. 30, 2014 RSU's Minimum | Sep. 30, 2014 RSU's Maximum | Sep. 30, 2014 Plans 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 | $ 1,100,000 | $ 1,000,000 | $ 3,600,000 | $ 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized compensation cost, net of expected forfeitures |  |  |  |  | 4,100,000 |  | 4,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted average expected period over which the expense is to be recognized |  |  |  |  |  |  | 2 years 1 month 17 days |  |  |  |  | 2 years 5 months 27 days |  |  |  |  |  |  |
Stock-based compensation expense, recognition period |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 5 years |  |  |  |  |
Unamortized compensation cost for awards other than options, net of expected forfeitures |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |
Tax benefits associated with exercise of stock options |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |
Available for Grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,865,000 | 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) | (9,000) | (499,000)
Options granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (120,000) |  | (49,000) |  |
Options cancelled (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 257,000 | 4,000 | 60,000 |  |
Options expired (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (257,000) | (4,000) | (60,000) |  |
Balance at the end of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,745,000 | 1,865,000 | 374,000 |  |
Number of Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  |  |  |  |  |  |  | 3,329,000 | 3,224,000 | 3,178,000 |  |  |  | 6,360,000 | 6,416,000 | 6,727,000 |  |
Options granted (in shares) |  |  |  |  |  |  |  |  | 95,000 | 125,000 | 118,000 |  |  |  | 120,000 |  | 49,000 |  |
Options cancelled (in shares) |  |  |  |  |  |  |  |  |  |  | (40,000) |  |  |  | (257,000) | (4,000) | (60,000) |  |
Options exercised (in shares) |  |  |  |  |  |  |  |  | (5,000) | (20,000) | (32,000) |  |  |  | (48,000) | (52,000) | (300,000) |  |
Balance at the end of the period (in shares) |  |  |  |  |  |  |  |  | 3,419,000 | 3,329,000 | 3,224,000 |  |  |  | 6,175,000 | 6,360,000 | 6,416,000 |  |
Weighted Average Exercise Prices |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  |  | $ 4.45 | $ 4.46 | $ 4.42 |  |  |  | $ 3.91 | $ 3.89 | $ 3.86 |  |
Options granted (in dollars per share) |  |  |  |  |  |  |  |  | $ 3.11 | $ 3.87 | $ 5.22 |  |  |  | $ 3.10 |  | $ 4.69 |  |
Options cancelled (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 4.47 |  |  |  | $ 4.55 | $ 5.21 | $ 3.42 |  |
Options exercised (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.55 | $ 1.55 | $ 3.88 |  |  |  | $ 1.72 | $ 1.61 | $ 3.58 |  |
Options expired (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.55 | $ 5.21 | $ 3.42 |  |
Balance at the end of the period (in dollars per share) |  |  |  |  |  |  |  |  | $ 4.42 | $ 4.45 | $ 4.46 |  |  |  | $ 3.88 | $ 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 The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + 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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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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