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Stock-Based Compensation (Details) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Options | Dec. 31, 2012 Options | Dec. 31, 2011 Options | Jun. 30, 2011 Options Executive vice president | Dec. 31, 2013 Inducement grant options | Dec. 31, 2012 Inducement grant options | Dec. 31, 2011 Inducement grant options | Jun. 30, 2010 ESPP Item | Dec. 31, 2013 ESPP | Dec. 31, 2012 ESPP | Dec. 31, 2011 ESPP | Dec. 31, 2013 ESPP Minimum | Jun. 30, 2010 ESPP Maximum | Dec. 31, 2013 ESPP Maximum | Dec. 31, 2013 Plans Options | Dec. 31, 2012 Plans Options | Dec. 31, 2011 Plans Options | Dec. 31, 2013 Plans RSU's | Dec. 31, 2013 Amended 2000 Plan | Dec. 31, 2013 Amended 2000 Plan Options | Jun. 30, 2010 2010 Plan | Dec. 31, 2013 2010 Plan Options | Jun. 30, 2010 2010 Plan Options | Jun. 30, 2010 2010 Plan Options Minimum | Jun. 30, 2010 2010 Plan Options Maximum
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  |  |  |  |  | 3,178,000 | 3,358,000 | 4,815,000 |  |  |  |  |  |  |  | 6,727,000 | 6,872,000 | 6,528,000 |  |  | 1,879,000 |  |  |  |  |
Weighted-average exercise price (in dollars per share) |  |  |  |  |  |  |  | $ 4.42 | $ 4.29 | $ 3.29 |  |  |  |  |  |  |  | $ 3.86 | $ 4.05 | $ 4.48 |  |  | $ 3.79 |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |
Annual increase in the share reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 500,000 | 500,000 |  |  |  | 500,000 |  |  |  |
Term of Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  | 6 years | 10 years
Maximum annual option grants or other awards to the entity's non-employee directors (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000 |  |
Maximum one-time grant of an option or other awards to the entity's non-employee directors (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,000 |  |
Maximum term of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Minimum percentage of voting rights required for applicability of a specific expiration term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |
Maximum expiration term of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |
Maximum amount of shares that eligible employee may purchase annually (in dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of offering periods |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering period |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price to be paid by participants as a percentage of price per share either at the beginning or the end of each six-month offering period, whichever is less |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued under the plan |  |  |  |  |  |  |  |  |  |  |  | 275,000 | 351,000 | 313,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price (in dollars) |  |  |  |  |  |  |  |  |  |  |  | 800,000 | 1,100,000 | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized and unissued |  |  |  |  |  |  |  |  |  |  |  | 1,061,000 |  |  |  |  |  | 422,000 | 1,265,000 | 1,977,000 |  | 0 |  |  |  |  |  |
Stock-based compensation expense | 3,700,000 | 3,800,000 | 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefits associated with exercise of stock options |  |  |  | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option granted as compensation for the consulting services (in shares) |  |  |  |  |  |  | 675,000 | 347,000 | 350,000 | 400,000 |  |  |  |  |  |  |  | 1,543,000 | 1,827,000 | 2,201,000 |  |  |  |  |  |  |  |
Assumptions used in estimation of fair value of the share-based payment awards on the grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate, minimum (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 0.20% | 0.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate, maximum (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 1.70% | 0.80% | 1.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volatility, minimum (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 57.70% | 59.50% | 40.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volatility, maximum (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 62.90% | 73.10% | 65.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected life |  |  |  |  |  |  |  |  |  |  |  |  | 4 years | 4 years | 4 years |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Dividend yield (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for Grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,265,000 | 1,977,000 | 3,650,000 |  | 0 |  |  |  |  |  |
Additional shares authorized under the 2010 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 500,000 | 500,000 |  |  |  | 500,000 |  |  |  |
Restricted stock units granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (35,000) |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,543,000) | (1,827,000) | (2,201,000) |  |  |  |  |  |  |  |
Options cancelled (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,123,000 | 1,217,000 | 743,000 |  |  |  |  |  |  |  |
Options expired (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (888,000) | (602,000) | (715,000) |  |  |  |  |  |  |  |
Balance at the end of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,061,000 |  |  |  |  |  | 422,000 | 1,265,000 | 1,977,000 |  | 0 |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  |  |  |  |  |  | 3,358,000 | 4,815,000 | 4,812,000 |  |  |  |  |  |  |  | 6,872,000 | 6,528,000 | 5,594,000 |  |  | 1,879,000 |  |  |  |  |
Options granted (in shares) |  |  |  |  |  |  | 675,000 | 347,000 | 350,000 | 400,000 |  |  |  |  |  |  |  | 1,543,000 | 1,827,000 | 2,201,000 |  |  |  |  |  |  |  |
Options cancelled (in shares) |  |  |  |  |  |  |  | (7,000) | (550,000) | (48,000) |  |  |  |  |  |  |  | (1,123,000) | (1,217,000) | (743,000) |  |  |  |  |  |  |  |
Options exercised (in shares) |  |  |  |  |  |  |  | (520,000) | (1,257,000) | (349,000) |  |  |  |  |  |  |  | (565,000) | (266,000) | (524,000) |  |  |  |  |  |  |  |
Balance at the end of the period (in shares) |  |  |  |  |  |  |  | 3,178,000 | 3,358,000 | 4,815,000 |  |  |  |  |  |  |  | 6,727,000 | 6,872,000 | 6,528,000 |  |  | 1,879,000 |  |  |  |  |
Weighted Average Exercise Prices |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  | $ 4.29 | $ 3.29 | $ 2.92 |  |  |  |  |  |  |  | $ 4.05 | $ 4.48 | $ 4.64 |  |  | $ 3.79 |  |  |  |  |
Options granted (in dollars per share) |  |  |  |  |  |  |  | $ 3.94 | $ 3.92 | $ 6.06 |  |  |  |  |  |  |  | $ 4.27 | $ 3.19 | $ 4.13 |  |  |  |  |  |  |  |
Options cancelled (in dollars per share) |  |  |  |  |  |  |  | $ 3.45 | $ 1.55 | $ 1.54 |  |  |  |  |  |  |  | $ 6.00 | $ 5.42 | $ 5.41 |  |  |  |  |  |  |  |
Options exercised (in dollars per share) |  |  |  |  |  |  |  | $ 3.28 | $ 1.55 | $ 1.55 |  |  |  |  |  |  |  | $ 3.05 | $ 2.38 | $ 3.34 |  |  |  |  |  |  |  |
Options expired (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.49 | $ 6.89 | $ 5.41 |  |  |  |  |  |  |  |
Balance at the end of the period (in dollars per share) |  |  |  |  |  |  |  | $ 4.42 | $ 4.29 | $ 3.29 |  |  |  |  |  |  |  | $ 3.86 | $ 4.05 | $ 4.48 |  |  | $ 3.79 |  |  |  |  |

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- Definition Represents the maximum expiration term of awards granted applicable to holders of a specific percentage of voting rights of all classes of outstanding stock on the date of grant. + References No definition available. + Details
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- Definition Represents the minimum percentage of voting rights of all classes of outstanding stock, on the date of grant, held by the persons to whom awards were granted for applicability of specific expiration term of options. + References No definition available. + Details
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- Definition Represents the number of offering periods per annum over which an employee may purchase the shares of common stock of the entity under the stock-based compensation arrangements. + References No definition available. + Details
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- Definition Represents the number of shares available for grant cancelled during the period. + References No definition available. + Details
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- Definition Represents the shares reserved for grant under option or other awards to the entity's non-employee directors annually under the share-based compensation plan. + References No definition available. + Details
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- Definition Represents the shares reserved for one-time grant under option or other awards to the entity's non-employee directors under the share-based compensation plan. + References No definition available. + Details
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- Definition Represents the offering period over which an employee may purchase the shares of common stock of the entity under the stock-based compensation arrangements. + References No definition available. + Details
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- Definition Represents the term of share-based compensation plans. + References No definition available. + Details
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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 Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: 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.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -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 The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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- Definition Number of share instruments newly issued under a share-based compensation 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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