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Summary of Significant Accounting Policies - PPE (Details) - USD ($)
6 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Jun. 30, 2016
Jun. 30, 2015
Property and Equipment        
(Losses) gains on the sale/disposal of furniture and equipment (in dollars) $ (1,130,000) $ (239,000) $ 21,000 $ (7,000)
Leasehold impairment charge 970,000 $ 180,000    
Machinery and equipment        
Property and Equipment        
Estimated useful lives   5 years    
Computer hardware and software        
Property and Equipment        
Estimated useful lives   3 years    
Furniture and fixtures        
Property and Equipment        
Estimated useful lives   5 years    
(Losses) gains on the sale/disposal of furniture and equipment (in dollars) $ (1,100,000) $ (239,000) $ 21,000 $ (7,000)
Leasehold improvements | Maximum        
Property and Equipment        
Estimated useful lives   7 years