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Fair value of financial instruments - Fair Value (Details) - USD ($)
Mar. 31, 2020
Mar. 04, 2020
Jan. 21, 2020
Dec. 31, 2019
Nov. 14, 2019
Oct. 29, 2019
Aug. 30, 2019
May 20, 2019
Series B Preferred Stock Liability [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Series B Preferred Stock FV $ 153,700,000              
Series B Preferred Stock   350            
Series B Preferred Stock Warrants at closing[Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Series B Preferred Stock Warrant Exercise Price               $ 0.0001
10% Warrants at fully diluted share count               0.1
Exercise price of securities excluded at closing (in dollars per share)               $ 11.50
Warrants Issued at Closing of Equity Agreement   12,029     3,568,750   900,000 2,545,934
Share price (in dollars per share)     $ 3.69 $ 3.22 $ 2.20   $ 3.75 $ 4.21
Series B-3 Exchange Warrants [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Warrants Issued at Closing of Equity Agreement           657,383    
Share price (in dollars per share)     $ 3.69 $ 3.22   $ 2.20    
Series A Exchange Percentage for Series B-3           50.00%    
Series B Preferred - Series A Conversion Warrants [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Series B Preferred Stock Warrant Exercise Price               0.0001
Share price (in dollars per share)               $ 4.21
Series B-1 Preferred Stock 6% Warrants [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
6% warrants               0.06
Rights Offering Fair Value [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Series B Preferred Stock FV   $ 313,000            
Preferred Stock Warrants at Closing FV Nonrecurring   $ 37,000            
2020 Commitment [Member] [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Proceeds Received for series b preferred $ 15,000,000