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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Level 1 [Member] |  |
Assets |  |
Total cash equivalents and investments | $ 20,736 | $ 101,839
Level 1 [Member] | Auction Rate Securities [Member] |  |
Assets |  |
Total cash equivalents and investments |  | 1,790
Level 1 [Member] | Money market funds [Member] |  |
Assets |  |
Total cash equivalents and investments | 20,736 | 100,049
Level 1 [Member] | Government-backed security [Member] |  |
Assets |  |
Total cash equivalents and investments |  |
Level 1 [Member] | Asset-backed securities [Member] |  |
Assets |  |
Total cash equivalents and investments |  |
Level 1 [Member] | Corporate Debt Securities [Member] |  |
Assets |  |
Total cash equivalents and investments |  |
Level 2 [Member] |  |
Assets |  |
Total cash equivalents and investments | 165,806 | 26,978
Level 2 [Member] | Auction Rate Securities [Member] |  |
Assets |  |
Total cash equivalents and investments |  |
Level 2 [Member] | Money market funds [Member] |  |
Assets |  |
Total cash equivalents and investments |  |
Level 2 [Member] | Government-backed security [Member] |  |
Assets |  |
Total cash equivalents and investments | 10,000 |
Level 2 [Member] | Asset-backed securities [Member] |  |
Assets |  |
Total cash equivalents and investments | 50,300 |
Level 2 [Member] | Corporate Debt Securities [Member] |  |
Assets |  |
Total cash equivalents and investments | 105,506 | 26,978
Level 3 [Member] |  |
Assets |  |
Total cash equivalents and investments |  |
Level 3 [Member] | Auction Rate Securities [Member] |  |
Assets |  |
Total cash equivalents and investments |  |
Level 3 [Member] | Money market funds [Member] |  |
Assets |  |
Total cash equivalents and investments |  |
Level 3 [Member] | Government-backed security [Member] |  |
Assets |  |
Total cash equivalents and investments |  |
Level 3 [Member] | Asset-backed securities [Member] |  |
Assets |  |
Total cash equivalents and investments |  |
Level 3 [Member] | Corporate Debt Securities [Member] |  |
Assets |  |
Total cash equivalents and investments |  |

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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