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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2012
Fair Value Hierarchy For Financial Assets And Liabilities Measured At Fair Value On Recurring Basis | The following table represents the fair value hierarchy for our financial assets (cash equivalents and marketable securities) measured at fair value on a recurring basis as of December 31, 2012 and 2011 (in thousands):
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 3,140 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,140 |
U.S. government agency securities |  |  | — |  |  |  | 119,233 |  |  |  | — |  |  |  | 119,233 |
U.S. treasury securities |  |  | — |  |  |  | 500 |  |  |  | — |  |  |  | 500 |
Municipal securities |  |  | — |  |  |  | 715 |  |  |  | — |  |  |  | 715 |
Total |  | $ | 3,140 |  |  | $ | 120,448 |  |  | $ | — |  |  | $ | 123,588 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 17,171 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,171 |
U.S. government agency securities |  |  | — |  |  |  | 28,495 |  |  |  | — |  |  |  | 28,495 |
U.S. treasury securities |  |  | — |  |  |  | 7,425 |  |  |  | — |  |  |  | 7,425 |
Corporate debt securities, secured by the U.S. government |  |  | — |  |  |  | 58,580 |  |  |  | — |  |  |  | 58,580 |
Total |  | $ | 17,171 |  |  | $ | 94,500 |  |  | $ | — |  |  | $ | 111,671 |
Changes In Fair Value Measurement Of Contingent Liability | The following table represents the changes in the fair value measurement of the contingent liability (in thousands):
Contingent liability to Holdings |  | Amount |
Acquisition date fair value measurement at December 30, 2009 |  | $ | 3,040 |
Adjustment to fair value measurement |  |  | (2,197 | )
Balance as of December 31, 2010 |  |  | 843 |
Adjustment to fair value measurement |  |  | (843 | )
Balance as of December 31, 2011 and 2012 |  | $ | — |

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- Definition Contingent Consideration Liability Measured At Fair Value On Recurring Basis Using Significant Unobservable Input [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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). + 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=7578670&loc=d3e19190-110258 + Details
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