Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Service Agreements (Details)

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Commitments and Contingencies - Service Agreements (Details) - USD ($)
 3 Months Ended 6 Months Ended
Aug. 06, 2015
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2011
Service Agreements            
Term of agreement 5 years          
Commitment extension period       18 months    
Amount required to pay for execution of the agreement           $ 151,318
Cost of goods sold            
Service Agreements            
License fees paid   $ 454,000 $ 354,000 $ 873,000 $ 671,000