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Fair Value of Financial Instruments (Details 3) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Fair value hierarchy for its financial assets |  |
Transfer of assets between Level 1 to Level 2 | $ 0 | $ 0
Transfer of liabilities between Level 1 to Level 2 | 0 | 0
Transfer of assets between Level 2 to Level 1 | 0 | 0
Transfer of liabilities between Level 2 to Level 1 | 0 | 0
Fair Value |  |
Fair value hierarchy for its financial assets |  |
Money market funds | 1,167 | 3,012
Total assets | 45,230 | 49,130
Fair Value | Certificates of deposit |  |
Fair value hierarchy for its financial assets |  |
Available-for-sale securities | 5,417 | 6,429
Fair Value | Corporate notes |  |
Fair value hierarchy for its financial assets |  |
Available-for-sale securities | 19,902 | 16,719
Fair Value | U.S. government debt securities |  |
Fair value hierarchy for its financial assets |  |
Available-for-sale securities | 18,744 | 22,970
Level 1 |  |
Fair value hierarchy for its financial assets |  |
Money market funds | 1,167 | 3,012
Total assets | 1,167 | 3,012
Level 2 |  |
Fair value hierarchy for its financial assets |  |
Total assets | 44,063 | 46,118
Level 2 | Certificates of deposit |  |
Fair value hierarchy for its financial assets |  |
Available-for-sale securities | 5,417 | 6,429
Level 2 | Corporate notes |  |
Fair value hierarchy for its financial assets |  |
Available-for-sale securities | 19,902 | 16,719
Level 2 | U.S. government debt securities |  |
Fair value hierarchy for its financial assets |  |
Available-for-sale securities | $ 18,744 | $ 22,970

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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