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Discontinued Operations, Sale of Cold-EEZE® Business - Schedule of Proceeds from Sale of Business (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract] |  |  |
Gross consideration from the sale of the Cold-EEZE® Business | $ 50,000 |  |
Closing and transaction costs | (4,175) |  |
Net proceeds from sale of the Cold-EEZE® Business | 45,825 |  |
Book value of assets sold | (13) |  |
Gain on sale of the Cold-EEZE® Business before income taxes | 45,812 |  |
Income tax expense | (18,838) |  |
Gain on sale of the Cold-EEZE® Business after income taxes | 26,974 |  |
Cash paid at closing, net of closing and transaction costs | 43,145 |  |
Proceeds due on sale of assets, cash held in escrow | 5,000 |  |
Net proceeds from the sale of assets | $ 48,145 |  |

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