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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.

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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.

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No definition available.

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