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Summary of Significant Accounting Policies - Restricted Cash and Inventories (Details) - USD ($)
12 Months Ended
Aug. 18, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 22, 2015
Restricted Cash        
Maximum borrowing capacity $ 8.0      
Initial loan commitment 6.0      
Base minimum cash balance $ 4,500,000   $ 3,000,000 $ 3,000,000
Repayment of loan from restricted cash   $ 2,500,000    
Restricted cash, current   511,293    
Inventories        
Inventory write-downs   $ 0