Loss per share - Anti-dilutive securities (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Anti-dilutive securities
Anti-dilutive preferred shares, stock options, warrants, and profits interests	19,697	18,613
Stock options
Anti-dilutive securities
Anti-dilutive preferred shares, stock options, warrants, and profits interests	7,734	8,134
Warrants | Preferred Stock
Anti-dilutive securities
Anti-dilutive preferred shares, stock options, warrants, and profits interests	238	509
Warrants | Common Stock
Anti-dilutive securities
Anti-dilutive preferred shares, stock options, warrants, and profits interests	7,071
Profits interests
Anti-dilutive securities
Anti-dilutive preferred shares, stock options, warrants, and profits interests	4,654	9,973