Net loss per share - Antidilutive Securities Excluded from Computation of Net Income per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (shares)	33,956	24,875	29,321	24,667
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	33,956	24,875	29,321	24,667
Convertible Debt Securities
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (shares)	0	10,050	0	10,050
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	0	10,050	0	10,050
Share-based Payment Arrangement
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (shares)	11,248	14,825	11,042	14,617
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	11,248	14,825	11,042	14,617
Warrant
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (shares)	3,213	0	3,015	0
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	3,213	0	3,015	0
Convertible Debentures
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (shares)	19,495	0	15,264	0
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	19,495	0	15,264	0