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Related Party Transactions - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Jul. 01, 2016
Aug. 13, 2014
Sep. 30, 2014
Apr. 30, 2014
Mar. 31, 2014
Jun. 30, 2017
Jun. 30, 2016
Orthotec LLC, litigation settlement              
Related Party Transaction [Line Items]              
Payments of settlement       $ 15,750 $ 1,750 $ 29,600  
Judgment assessed by court for (against) company   $ (49,000)          
Orthotec LLC, litigation settlement | HealthpointCapital, LLC              
Related Party Transaction [Line Items]              
Payments of settlement $ 1,000         1,100  
Judgment assessed by court for (against) company     $ (5,000)        
HealthpointCapital, LLC              
Related Party Transaction [Line Items]              
Incurred expenses (less than $.1 million)           100 $ 100
Payable liability (less than $.1 million)           $ 100