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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investment and other income |  | $ 2,407 | $ 4,153 | $ 4,487
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 |  | $ 1,800 | $ 2,400 | $ 2,500

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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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