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Commitments and contingencies - Registration Payment Arrangement (Details)
Nov. 05, 2018
USD ($)
EquityInstruments
Second Amendment Facility Due in May 2020 | Debt issued to entities affiliated with Deerfield | Common Stock | Maximum  
Registration Payment Arrangement  
Number of shares which may be issued for conversion of convertible notes | EquityInstruments 3,796,668
Registration Agreement | Senior Secured Convertible Notes  
Registration Payment Arrangement  
Time period after date of any Registration Failure during which additional damages are required to be paid 30 days
Additional damages payable upon any Registration Failure, as percent of original principal amount of debt 2.00%
Maximum reimbursable legal fees | $ $ 25,000