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Short-Term Investments (Tables) | 12 Months Ended
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Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract] |
Summary of Short-Term Investments | The following table summarizes the Company’s short-term investments (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
As of December 31, 2013 |  |  |  |  |  |  |
State, municipal and local government agencies bonds | $ | 40,426 |  |  | $ | 38 |  |  | $ | (15 | ) |  | $ | 40,449 |
Corporate bonds | 33,483 |  |  | 20 |  |  | (7 | ) |  | 33,496 |
Commercial paper | 2,299 |  |  | — |  |  | — |  |  | 2,299 |
U.S. federal government bonds | 4,004 |  |  | 4 |  |  | — |  |  | 4,008 |
Total short-term investments | $ | 80,212 |  |  | $ | 62 |  |  | $ | (22 | ) |  | $ | 80,252 |
As of December 31, 2012 |  |  |  |  |  |  |
Certificates of deposit | $ | 1,603 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,603 |
State, municipal and local government agencies bonds | 59,009 |  |  | 45 |  |  | (4 | ) |  | 59,050 |
Corporate bonds | 31,568 |  |  | 4 |  |  | (10 | ) |  | 31,562 |
Commercial paper | 10,287 |  |  | 1 |  |  | — |  |  | 10,288 |
U.S. federal government bonds | 2,003 |  |  | — |  |  | — |  |  | 2,003 |
Total short-term investments | $ | 104,470 |  |  | $ | 50 |  |  | $ | (14 | ) |  | $ | 104,506 |
Maturities of Short-Term Investments | The following table summarizes the maturities of the Company’s short-term investments (in thousands):
| December 31,
| 2013 |  | 2012
Less than one year | $ | 55,278 |  |  | $ | 76,779 |
Due in 1 - 2 years | 24,974 |  |  | 27,727 |
Total short-term investments | $ | 80,252 |  |  | $ | 104,506 |

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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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: 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=27724398&loc=d3e27357-111563 Reference 3: 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=27724398&loc=d3e27337-111563 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 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: 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 7: 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=27724398&loc=d3e27161-111563 + Details
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