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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation | The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security at December 31, 2016 and 2015 were as follows:
|  | Amortized cost |  |  | Gross unrealized holding gains |  |  | Gross unrealized holding losses |  |  | Estimated fair value |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 20,028 |  |  | $ | 64 |  |  | $ | (122 | ) |  | $ | 19,970 |
Municipal bonds |  |  | 6,463 |  |  |  | 6 |  |  |  | (44 | ) |  |  | 6,425 |
Total available-for-sale securities |  | $ | 26,491 |  |  | $ | 70 |  |  | $ | (166 | ) |  | $ | 26,395 |
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 20,827 |  |  | $ | 50 |  |  | $ | (133 | ) |  | $ | 20,744 |
Municipal bonds |  |  | 5,608 |  |  |  | 18 |  |  |  | (5 | ) |  |  | 5,621 |
Total available-for-sale securities |  | $ | 26,435 |  |  | $ | 68 |  |  | $ | (138 | ) |  | $ | 26,365 |
Schedule of Maturities of Marketable Securities | Maturities of marketable securities classified as available-for-sale securities were as follows at December 31, 2016:
|  | Amortized |  |  | Estimated |
|  | cost |  |  | fair value |
Due within one year |  | $ | 5,029 |  |  | $ | 5,030 |
Due after one year through five years |  |  | 21,353 |  |  |  | 21,256 |
Due after five years through ten years |  |  | 109 |  |  |  | 109 |
Total available-for-sale securities |  | $ | 26,491 |  |  | $ | 26,395 |
Schedule of Available-for-sale Securities | The available-for-sale marketable securities in a gross unrealized loss position as of December 31, 2016 are summarized as follows:
|  | Less than 12 months |  |  | More than 12 months |  |  | Total |
|  | Estimated fair value |  |  | Gross unrealized holding losses |  |  | Estimated fair value |  |  | Gross unrealized holding losses |  |  | Estimated fair value |  |  | Gross unrealized holding losses |
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 10,294 |  |  | $ | (112 | ) |  |  | 1,029 |  |  | $ | (9 | ) |  | $ | 11,323 |  |  | $ | (121 | )
Municipal bonds |  |  | 3,910 |  |  |  | (45 | ) |  |  | — |  |  |  | — |  |  |  | 3,910 |  |  |  | (45 | )
|  | $ | 14,204 |  |  | $ | (157 | ) |  | $ | 1,029 |  |  | $ | (9 | ) |  | $ | 15,233 |  |  | $ | (166 | )

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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