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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investment and other income |  | $ 4,153 | $ 4,487 | $ 4,214
New Jersey tax benefits |  |  |  |
Amount of tax benefit | $ 9,800 |  |  |
Proceeds from sale of tax credits | $ 9,200 |  |  |
Base of operations requirement (in years) |  | 5 years |  |
Investment and other income |  | $ 2,400 | $ 2,500 | $ 2,700

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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=116825942&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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