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Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2014 Item | Dec. 31, 2013
Estimated fair values of available-for-sale securities with unrealized losses |  |
Number of maturity groups | 2 |
Investments by rolling maturity, Cost |  |
Due within 1 year | $ 27,975 | $ 32,183
Due in 1-2 years | 9,115 | 13,922
Total | 37,090 | 46,105
Investments by rolling maturity, Unrealized Gains |  |
Due within 1 year | 20 | 14
Due in 1-2 years | 1 | 9
Total | 21 | 23
Investments by rolling maturity, Unrealized Losses |  |
Due within 1 year | (1) | (5)
Due in 1-2 years | (10) | (5)
Total | (11) | (10)
Investments by rolling maturity, Fair Value |  |
Due within 1 year | 27,994 | 32,192
Due in 1-2 years | 9,106 | 13,926
Total | 37,100 | 46,118
Short-term investments |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 1,432 | 12,213
Unrealized Losses | (1) | (5)
Fair Value | 1,431 | 12,208
Investments by rolling maturity, Unrealized Gains |  |
Total | 20 | 14
Investments by rolling maturity, Unrealized Losses |  |
Total | (1) | (5)
Short-term investments | U.S. government debt securities |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost |  | 5,289
Unrealized Losses |  | (1)
Fair Value |  | 5,288
Investments by rolling maturity, Unrealized Gains |  |
Total | 5 | 11
Investments by rolling maturity, Unrealized Losses |  |
Total |  | (1)
Short-term investments | Corporate notes |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 1,432 | 3,844
Unrealized Losses | (1) | (2)
Fair Value | 1,431 | 3,842
Investments by rolling maturity, Unrealized Gains |  |
Total | 14 | 2
Investments by rolling maturity, Unrealized Losses |  |
Total | (1) | (2)
Short-term investments | Certificates of deposit |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost |  | 3,080
Unrealized Losses |  | (2)
Fair Value |  | 3,078
Investments by rolling maturity, Unrealized Gains |  |
Total | 1 | 1
Investments by rolling maturity, Unrealized Losses |  |
Total |  | (2)
Long-term investments |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 7,870 | 3,694
Unrealized Losses | (10) | (5)
Fair Value | 7,860 | 3,689
Investments by rolling maturity, Unrealized Gains |  |
Total | 1 | 9
Investments by rolling maturity, Unrealized Losses |  |
Total | (10) | (5)
Long-term investments | U.S. government debt securities |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 2,800 | 1,253
Unrealized Losses | (2) |
Fair Value | 2,798 | 1,253
Investments by rolling maturity, Unrealized Losses |  |
Total | (2) |
Long-term investments | Corporate notes |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 5,070 | 1,001
Unrealized Losses | (8) | (1)
Fair Value | 5,062 | 1,000
Investments by rolling maturity, Unrealized Gains |  |
Total | 1 | 9
Investments by rolling maturity, Unrealized Losses |  |
Total | (8) | (1)
Long-term investments | Certificates of deposit |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost |  | 1,440
Unrealized Losses |  | (4)
Fair Value |  | 1,436
Investments by rolling maturity, Unrealized Losses |  |
Total |  | $ (4)

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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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