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Summary of Significant Accounting Policies - Restricted Cash and Inventories (Details) - USD ($)
6 Months Ended
Apr. 21, 2016
Aug. 18, 2015
Jun. 30, 2017
Dec. 31, 2016
Dec. 22, 2015
Restricted Cash          
Maximum borrowing capacity   $ 8,000,000      
Initial loan commitment   6,000,000      
Base minimum cash balance   $ 4,500,000     $ 3,000,000
Repayment of loan from restricted cash $ 1,500,000   $ 3,000,000    
Restricted cash, current     0 $ 511,293  
Inventories          
Inventory write-downs     $ 0