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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2013
Fair Value Disclosures [Abstract] |
Financial Assets and Liabilities Measured at Fair Value Based on Three-Tier Fair Value Hierarchy | The following table sets forth the fair value of the Company’s financial assets and liabilities measured at fair value based on the three-tier fair value hierarchy (in thousands):
| Level 1 |  | Level 2 |  | Level 3 |  | Total
As of December 31, 2013 |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |
Money market funds | $ | 51,014 |  |  | $ | — |  |  | $ | — |  |  | $ | 51,014 |
Short-term investments |  |  |  |  |  |  |
State, municipal and local government agencies bonds | — |  |  | 40,449 |  |  | — |  |  | 40,449 |
Corporate bonds | — |  |  | 33,496 |  |  | — |  |  | 33,496 |
Commercial paper | — |  |  | 2,299 |  |  | — |  |  | 2,299 |
U.S. federal government bonds | 4,008 |  |  | — |  |  | — |  |  | 4,008 |
Prepaids and other current assets |  |  |  |  |  |  |
Derivative assets (1) | — |  |  | 196 |  |  | — |  |  | 196 |
Total assets measured and recorded at fair value | $ | 55,022 |  |  | $ | 76,440 |  |  | $ | — |  |  | $ | 131,462 |
Accrued Liabilities |  |  |  |  |  |  |
Derivative Liabilities (1) | $ | — |  |  | $ | 195 |  |  | $ | — |  |  | $ | 195 |
Total liabilities measured and recorded at fair value | $ | — |  |  | $ | 195 |  |  | $ | — |  |  | $ | 195 |
| Level 1 |  | Level 2 |  | Level 3 |  | Total
As of December 31, 2012 |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |
Money market funds | $ | 54,923 |  |  | $ | — |  |  | $ | — |  |  | $ | 54,923 |
Corporate bonds with maturity less than 90 days | — |  |  | 3,614 |  |  | — |  |  | 3,614 |
U.S. federal government bonds with maturity less than 90 days | 3,005 |  |  | — |  |  | — |  |  | 3,005 |
Short-term investments |  |  |  |  |  |  |
Certificates of deposit | — |  |  | 1,603 |  |  | — |  |  | 1,603 |
State, municipal and local government agencies bonds | — |  |  | 59,050 |  |  | — |  |  | 59,050 |
Corporate bonds | — |  |  | 31,562 |  |  | — |  |  | 31,562 |
Commercial paper | — |  |  | 10,288 |  |  | — |  |  | 10,288 |
U.S. federal government bonds | 2,003 |  |  | — |  |  | — |  |  | 2,003 |
Prepaids and other current assets |  |  |  |  |  |  |
Derivative assets (1) | — |  |  | 344 |  |  | — |  |  | 344 |
Total assets measured and recorded at fair value | $ | 59,931 |  |  | $ | 106,461 |  |  | $ | — |  |  | $ | 166,392 |
Accrued liabilities |  |  |  |  |  |  |
Derivative liabilities (1) | $ | — |  |  | $ | 143 |  |  | $ | — |  |  | $ | 143 |
Total liabilities measured and recorded at fair value | $ | — |  |  | $ | 143 |  |  | $ | — |  |  | $ | 143 |
(1) Derivative assets and liabilities represent forward currency exchange contracts. The Company enters into these contracts to minimize the short-term impact of foreign currency exchange rates fluctuations primarily from trade and inter-company receivables and payables.

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- Definition Tabular disclosure of assets, 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). + 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=25499696&loc=d3e19190-110258 Reference 2: 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=25499696&loc=d3e19207-110258 + Details
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