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Purchase commitment (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Purchase commitment [Abstract] |  |  |
Total purchase commitment to Norwood Laboratories Inc. |  | $ 0 | $ 15,200,000
Materials purchased from Norwood Laboratories Inc as of December 31, 2014 | $ 4,500,000 | $ 6,200,000 | $ 1,500,000

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- References No definition available. + Details
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- Definition Raw materials related to the Company's RSDL product purchased from Norwood. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
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