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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2011
Estimated Useful Lives | The estimated useful lives, by asset classification, are as follows:
Asset Classification |  | Useful Lives
Computer equipment and software |  | 3 - 5 years
Furniture and fixtures |  | 5 years
Leasehold Improvements |  | Lesser of useful life or lease term
Liability Measured at Fair Value on a Recurring Basis | The following table presents information about the Company’s liability as of December 31, 2011 and 2010 that is measured at fair value on a recurring basis and indicates the fair value hierarchy of the valuation techniques the Company utilized to determine such fair value:
|  | December 31, 2011 |
In thousands |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Asset: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 39 |  |  | $ | 39 |  |  | $ | — |  |  | $ | — |
Liability: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant derivative liability |  | $ | 123,125 |  |  | $ | — |  |  | $ | — |  |  | $ | 123,125 |
|  | December 31, 2010 |
In thousands |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Liability: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant derivative liability |  | $ | 230,069 |  |  | $ | — |  |  | $ | — |  |  | $ | 230,069 |
Change in Fair Value of Warrant Derivative Liabilities | The change in the fair value of the warrant derivative liabilities is as follows (in thousands):
|  | October 2009 Warrants |  |  | June and July 2009 Warrants |  |  | May 2008 Participation Rights |  |  | December 2007 Warrants |  |  | Totals |
Balance at December 31, 2008 |  | $ | — |  |  | $ | — |  |  | $ | 504 |  |  | $ | 533 |  |  | $ | 1,037 |
Initial measurement, June and July 2009 warrants |  |  | — |  |  |  | 2,803 |  |  |  | — |  |  |  | — |  |  |  | 2,803 |
Initial measurement, October 2009 financing warrants |  |  | 47,105 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 47,105 |
Initial measurement, October 2009 warrants issued to employees |  |  | 1,210 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,210 |
(Gain) loss on change in fair value of derivative liability |  |  | (6,625 | ) |  |  | 1,513 |  |  |  | (504 | ) |  |  | 479 |  |  |  | (5,137 | )
Compensation income for change in fair value of warrants issued to former employees |  |  | (170 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (170 | )
Transfers to equity |  |  | — |  |  |  | (4,316 | ) |  |  | — |  |  |  | (1,012 | ) |  |  | (5,328 | )
Balance at December 31, 2009 |  | $ | 41,520 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 41,520 |
Gain on change in fair value of derivative liability |  |  | 205,153 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 205,153 |
Compensation expense for change in fair value of warrants issued to former employees |  |  | 5,713 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,713 |
Transfers to equity |  |  | (22,317 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (22,317 | )
Balance at December 31, 2010 |  | $ | 230,069 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 230,069 |
Loss on change in fair value of derivative liability |  |  | 22,669 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 22,669 |
Compensation income for change in fair value of warrants issued to former employees |  |  | (96 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (96 | )
Transfers to equity |  |  | (129,517 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (129,517 | )
Balance at December 31, 2011 |  | $ | 123,125 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 123,125 |

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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 6 -Footnote 4 -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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