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FINANCIAL RISK MANAGEMENT - Liquidity risk (Details) - USD ($)
12 Months Ended
Nov. 17, 2017
Dec. 31, 2017
Nov. 13, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Liquidity Risk            
Cash and cash equivalents   $ 17,507,157   $ 22,954,571 $ 55,026,171 $ 5,193,561
Cash held in escrow       $ 70,000,000    
Gross proceeds from 2017 financing   $ 65,324,997        
CardiAQ            
Liquidity Risk            
Cash held in escrow     $ 70,000,000      
Remaining damages became due and payable     $ 42,000,000      
Amount of financing proceeds used to settle the damages and interest awards $ 42,000,000