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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2013
Fair Value Disclosures [Abstract] |
Schedule of assets and liabilities measured at fair value on recurring basis | The following tables present financial assets and liabilities at September 30, 2013 and December 31, 2012 for which the Company measures fair value on a recurring basis, by level, within the fair value hierarchy:
September 30, 2013 | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Valuation Technique
Assets |  |  |  |  |  |  |  |  |
Money market mutual funds | $ | 18,153 |  |  | $ | 18,153 |  |  | $ | — |  |  | $ | — |  |  | (a)
Government agency bonds | 9,529 |  |  | 9,529 |  |  | — |  |  | — |  |  | (a)
United States treasuries | 10,061 |  |  | 10,061 |  |  | — |  |  | — |  |  | (a)
Corporate notes | 8,052 |  |  | 8,052 |  |  | — |  |  | — |  |  | (a)
Certificates of deposit | 2,569 |  |  | 2,569 |  |  | — |  |  | — |  |  | (a)
Foreign currency forward contracts | 50 |  |  | — |  |  | 50 |  |  | — |  |  | (c)
Liabilities |  |  |  |  |  |  |  |  |
Interest rate swaps | $ | 376 |  |  | $ | — |  |  | $ | 376 |  |  | $ | — |  |  | (b)
December 31, 2012 | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Valuation Technique
Assets |  |  |  |  |  |  |  |  |
Money market mutual funds | $ | 9,921 |  |  | $ | 9,921 |  |  | $ | — |  |  | $ | — |  |  | (a)
Government agency bonds | 6,817 |  |  | 6,817 |  |  | — |  |  | — |  |  | (a)
United States treasuries | 6,089 |  |  | 6,089 |  |  | — |  |  | — |  |  | (a)
Corporate notes | 4,679 |  |  | 4,679 |  |  | — |  |  | — |  |  | (a)
Certificates of deposit | 1,800 |  |  | 1,800 |  |  | — |  |  | — |  |  | (a)
Liabilities |  |  |  |  |  |  |  |  |
Interest rate swaps | $ | 542 |  |  | $ | — |  |  | $ | 542 |  |  | $ | — |  |  | (b)

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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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