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Fair Value of Financial Instruments - Fair Value Hierarchy for Financial Assets (Details) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
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Fair value hierarchy for its financial assets |  |  |  |
Transfer of assets between Level 1 to Level 2 | $ 0 | $ 0 | $ 0 | $ 0
Transfer of assets between Level 2 to Level 1 | 0 | 0 | 0 | 0
Transfer of liabilities between Level 1 to Level 2 | 0 | 0 | 0 | 0
Transfer of liabilities between Level 2 to Level 1 | 0 | 0 | $ 0 | 0
Fair Value, Measurements, Recurring |  |  |  |
Fair value hierarchy for its financial assets |  |  |  |
Total assets |  | 8,358,000 |  | 18,458,000
Fair Value, Measurements, Recurring | Money market funds |  |  |  |
Fair value hierarchy for its financial assets |  |  |  |
Available-for-sale Securities | 620,000 | 84,000 |  | 2,238,000
Fair Value, Measurements, Recurring | U.S. government-sponsored enterprise bonds |  |  |  |
Fair value hierarchy for its financial assets |  |  |  |
Available-for-sale Securities |  | 3,767,000 |  | 7,525,000
Fair Value, Measurements, Recurring | Corporate notes |  |  |  |
Fair value hierarchy for its financial assets |  |  |  |
Available-for-sale Securities |  | 480,000 |  | 8,255,000
Fair Value, Measurements, Recurring | Municipal Bonds |  |  |  |
Fair value hierarchy for its financial assets |  |  |  |
Available-for-sale Securities |  | 4,027,000 |  | 200,000
Fair Value, Measurements, Recurring | Certificates of deposit |  |  |  |
Fair value hierarchy for its financial assets |  |  |  |
Available-for-sale Securities |  |  |  | 240,000
Fair Value, Measurements, Recurring | Level 1 |  |  |  |
Fair value hierarchy for its financial assets |  |  |  |
Total assets |  | 84,000 |  | 2,238,000
Fair Value, Measurements, Recurring | Level 1 | Money market funds |  |  |  |
Fair value hierarchy for its financial assets |  |  |  |
Available-for-sale Securities | $ 620,000 | 84,000 |  | 2,238,000
Fair Value, Measurements, Recurring | Level 2 |  |  |  |
Fair value hierarchy for its financial assets |  |  |  |
Total assets |  | 8,274,000 |  | 16,220,000
Fair Value, Measurements, Recurring | Level 2 | U.S. government-sponsored enterprise bonds |  |  |  |
Fair value hierarchy for its financial assets |  |  |  |
Available-for-sale Securities |  | 3,767,000 |  | 7,525,000
Fair Value, Measurements, Recurring | Level 2 | Corporate notes |  |  |  |
Fair value hierarchy for its financial assets |  |  |  |
Available-for-sale Securities |  | 480,000 |  | 8,255,000
Fair Value, Measurements, Recurring | Level 2 | Municipal Bonds |  |  |  |
Fair value hierarchy for its financial assets |  |  |  |
Available-for-sale Securities |  | $ 4,027,000 |  | 200,000
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit |  |  |  |
Fair value hierarchy for its financial assets |  |  |  |
Available-for-sale Securities |  |  |  | $ 240,000

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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=66048111&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=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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