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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2012
Summary of Significant Accounting Policies [Abstract] |
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 income (loss) per common share for the three and nine months ended September 30, 2012, and 2011 (in thousands, except per share amounts):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) used for basic calculation |  | $ | (3,460 | ) |  | $ | 2,260 |  |  | $ | (14,201 | ) |  | $ | (9,247 | )
Effect of revaluation of warrant liability |  |  | (873 | ) |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Adjusted net income (loss) used for diluted calculation |  | $ | (4,333 | ) |  | $ | 2,260 |  |  | $ | (14,201 | ) |  | $ | (9,247 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average number of common shares outstanding |  |  | 54,875 |  |  |  | 47,710 |  |  |  | 54,130 |  |  |  | 47,600 |
Effect of dilutive potential common shares resulting from warrants |  |  | 502 |  |  |  | 1,110 |  |  |  | 0 |  |  |  | 0 |
Diluted weighted average number of common shares outstanding |  |  | 55,377 |  |  |  | 48,820 |  |  |  | 54,130 |  |  |  | 47,600 |
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (0.06 | ) |  | $ | 0.05 |  |  | $ | (0.26 | ) |  | $ | (0.19 | )
Diluted |  | $ | (0.08 | ) |  | $ | 0.05 |  |  | $ | (0.26 | ) |  | $ | (0.19 | )
Anti-dilutive effect of common shares | The table below presents common shares underlying stock options, convertible preferred stock, employee stock purchase plan rights, warrants and restricted stock units that are excluded from the calculation of the weighted average number of common shares outstanding used for the calculation of diluted net income (loss) per common share. These are excluded from the calculation due to their anti-dilutive effect for the three and nine months ended September 30, 2012, and 2011 (shares in thousands):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Weighted average anti-dilutive common shares |  |  | 8,704 |  |  |  | 11,259 |  |  |  | 14,813 |  |  |  | 13,543 |
Changes in product warranty liability | A reconciliation of changes to the beginning and ending balances of the Company’s product warranty liability, from December 31, 2011, to September 30, 2012, was as follows (in thousands):
Balance at December 31, 2011 |  | $ | 0 |
Warranties provided |  |  | 857 |
Claims settled |  |  | (787 | )
Balance at September 30, 2012 |  | $ | 70 |

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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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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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