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Purchase commitments	6 Months Ended
Purchase commitments	Jun. 30, 2018
Purchase commitments [Abstract]
Purchase commitments	10. Purchase commitments During the first quarter of 2018, the Company entered into a three year contract with Norwood Laboratories Inc. ("Norwood") to purchase approximately $12.0 million of raw materials related to the Company's RSDL product. As of June 30, 2018, the Company had not purchased any materials under this commitment.