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Purchase commitment	12 Months Ended
Purchase commitment	Dec. 31, 2016
Purchase commitment [Abstract]
Purchase commitment	12. Purchase commitment During 2014 the Company entered into a contract with Norwood Laboratories Inc. ("Norwood") to purchase $15.2 million of raw materials related to the Company's RSDL product. For the years ended December 31, 2016, 2015 and 2014, the Company purchased $4.5 million, $6.2 million and $1.5 million, respectively, of materials under this commitment.