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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale securities | Included in marketable securities as of December 31, 2013 and 2012 are the following:
December 31, 2013 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 19,957 |  |  | $ | — |  |  | $ | — |  |  | $ | 19,957 |
Government agency bonds | 7,515 |  |  | — |  |  | (6 | ) |  | 7,509 |
United States treasuries | 8,035 |  |  | 6 |  |  | — |  |  | 8,041 |
Corporate notes | 8,457 |  |  |  |  | (4 | ) |  | 8,453 |
Certificates of deposit | 2,426 |  |  | — |  |  | — |  |  | 2,426 |
Total marketable securities designated as available for sale | $ | 46,390 |  |  | $ | 6 |  |  | $ | (10 | ) |  | $ | 46,386 |
December 31, 2012 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 9,921 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,921 |
Government agency bonds | 6,817 |  |  | 1 |  |  | — |  |  | 6,818 |
United States treasuries | 6,089 |  |  | — |  |  | — |  |  | 6,089 |
Corporate notes | 4,682 |  |  | — |  |  | (3 | ) |  | 4,679 |
Certificates of deposit | 1,800 |  |  | — |  |  | — |  |  | 1,800 |
Total marketable securities designated as available for sale | $ | 29,309 |  |  | $ | 1 |  |  | $ | (3 | ) |  | $ | 29,307 |
Available-for-sale securities, debt maturities, amortized cost and fair value basis | Effective maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
December 31, 2013 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 31,023 |  |  | $ | 31,023 |
Due after one year and within two years | 15,367 |  |  | 15,363 |
| $ | 46,390 |  |  | $ | 46,386 |
December 31, 2012 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 22,485 |  |  | $ | 22,485 |
Due after one year and within two years | 6,824 |  |  | 6,822 |
| $ | 29,309 |  |  | $ | 29,307 |

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- Definition Available-for-sale Securities, Debt Maturities, Amortized Cost And Fair Value Basis [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, b -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, b -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. + Details
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