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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Computation of Basic and Diluted Net Income (Loss) Per Common Share | The following table sets forth the reconciliation of the numerator and denominator used in the computation of basic and diluted net loss per common share for the years ended December 31, 2012, 2011 and 2010 (in thousands, except per share amounts):
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (15,917 | ) |  | $ | (16,982 | ) |  | $ | (16,911 | )
Effect of revaluation of warrant liability |  |  | (2,059 | ) |  |  | 0 |  |  |  | 0 |
Adjusted net loss used for dilution calculation |  | $ | (17,976 | ) |  | $ | (16,982 | ) |  | $ | (16,911 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average number of common shares outstanding |  |  | 54,515 |  |  |  | 48,050 |  |  |  | 40,300 |
Effect of dilutive potential common shares resulting from warrants accounted for as liabilities |  |  | 546 |  |  |  | 0 |  |  |  | 0 |
Diluted weighted average number of common shares outstanding |  |  | 55,061 |  |  |  | 48,050 |  |  |  | 40,300 |
Basic |  | $ | (0.29 | ) |  | $ | (0.35 | ) |  | $ | (0.42 | )
Diluted |  | $ | (0.33 | ) |  | $ | (0.35 | ) |  | $ | (0.42 | )
Anti-Dilutive Effect of Common Shares | The table below presents common shares underlying stock options, employee stock purchase plan rights, warrants, restricted stock units and/or convertible preferred stock that were excluded from the calculation of the weighted average number of common shares outstanding used for the calculation of diluted net loss per common share. These were excluded from the calculation due to their anti-dilutive effect for the years ended December 31, 2012, 2011 and 2010 (shares in thousands):
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Weighted average of anti-dilutive potential common shares |  |  | 8,716 |  |  |  | 13,595 |  |  |  | 9,867 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of the reconciliation of basic net earnings per share (or unit) to diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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