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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair value |  |
Investments available-for-sale |  | $ 1,776
U.S. government security funds |  |
Fair value |  |
Investments available-for-sale |  | 1,776
Recurring basis | Total |  |
Fair value |  |
Trading investment securities | $ 1,786 | 1,391
Total assets measured at fair value on a recurring basis | 1,786 | 3,167
Recurring basis | Total | U.S. government security funds |  |
Fair value |  |
Investments available-for-sale |  | 1,776
Recurring basis | Level 1 - Quoted Prices in Active Markets for Identical Assets |  |
Fair value |  |
Trading investment securities | 1,786 | 1,391
Total assets measured at fair value on a recurring basis | 1,786 | 3,167
Recurring basis | Level 1 - Quoted Prices in Active Markets for Identical Assets | U.S. government security funds |  |
Fair value |  |
Investments available-for-sale |  | 1,776
Recurring basis | Level 2 - Significant Other Observable Inputs |  |
Fair value |  |
Trading investment securities | 0 | 0
Total assets measured at fair value on a recurring basis | 0 | 0
Recurring basis | Level 2 - Significant Other Observable Inputs | U.S. government security funds |  |
Fair value |  |
Investments available-for-sale |  | 0
Recurring basis | Level 3 - Significant Unobservable Inputs |  |
Fair value |  |
Trading investment securities | 0 | 0
Total assets measured at fair value on a recurring basis | $ 0 | 0
Recurring basis | Level 3 - Significant Unobservable Inputs | U.S. government security funds |  |
Fair value |  |
Investments available-for-sale |  | $ 0

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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=65884222&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=73527792&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=66010992&loc=d3e26610-111562 + Details
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