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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Data (Unaudited) [Abstract] |
Selected quarterly financial data | Set forth below is selected quarterly financial data for each of the quarters in the years ended December 31, 2012 and 2011.
|  | 2012 Quarters Ended |
(in thousands except per share amounts) |  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
Operating loss |  | $ | (14,554 | ) |  | $ | (15,316 | ) |  | $ | (12,175 | ) |  | $ | (11,825 | )
Change in fair value of warranty liability, net |  |  | (338 | ) |  |  | 917 |  |  |  | 446 |  |  |  | 1,134 |
Net loss |  |  | (14,889 | ) |  |  | (14,512 | ) |  |  | (11,813 | ) |  |  | (10,657 | )
Basic and diluted loss per share |  |  | (0.31 | ) |  |  | (0.26 | ) |  |  | (0.18 | ) |  |  | (0.14 | )
|  | 2011 Quarters Ended |
(in thousands except per share amounts) |  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
Operating loss |  | $ | (7,814 | ) |  | $ | (10,486 | ) |  | $ | (12,181 | ) |  | $ | (15,974 | )
Change in fair value of warranty liability, net |  |  | 5,966 |  |  |  | 5,027 |  |  |  | 3,872 |  |  |  | 702 |
Net loss |  |  | (1,848 | ) |  |  | (5,459 | ) |  |  | (8,309 | ) |  |  | (15,268 | )
Basic and diluted loss per share |  |  | (0.04 | ) |  |  | (0.13 | ) |  |  | (0.18 | ) |  |  | (0.32 | )

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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