XML 69 R52.htm IDEA: XBRL DOCUMENT v3.6.0.2
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