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Stock-based compensation - Summary of stock-based compensation expense (Details) - USD ($)
10 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Employee Service Share-Based Compensation Allocation of Recognized Period Costs [Line Items]    
Stock-based compensation expense $ 1,462,061 $ 6,597,359
Research and development    
Employee Service Share-Based Compensation Allocation of Recognized Period Costs [Line Items]    
Stock-based compensation expense 648,001 3,192,063
Selling, general and administrative    
Employee Service Share-Based Compensation Allocation of Recognized Period Costs [Line Items]    
Stock-based compensation expense $ 814,060 $ 3,405,296