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Other Long-Term Liabilities- New Jersey tax benefits (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2015 | Dec. 31, 2014 | Jan. 31, 2014 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Investment and other income |  |  |  | $ 4,487 | $ 4,214 | $ 4,386
New Jersey tax benefits |  |  |  |  |  |
Amount of tax benefit | $ 9,800 | $ 1,900 | $ 1,100 |  |  |
Proceeds from sale of tax credits | $ 9,200 | $ 1,800 | $ 1,000 |  |  |
Base of operations requirement (in years) |  |  |  | 5 years |  |
Investment and other income |  |  |  | $ 2,500 | $ 2,700 | $ 2,800

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- Definition The amount of net proceeds received or will be received from the sale of net operating losses and research and development tax credits under New Jersey. + References No definition available. + Details
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- Definition Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business). + References No definition available. + Details
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