Shareholders' (Deficit) Equity - outstanding warrants (Details) - American Depositary Shares - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023	Mar. 31, 2024
Class of Warrant or Right [Line Items]
Equity-classified Warrants	5,133,924	658,610
Liability-classified Warrants	1,510,000	1,510,000
Warrants exercised	6,643,924	2,168,610
2019 Investor Warrants
Class of Warrant or Right [Line Items]
Equity-classified Warrants		59,211	59,211
Weighted-Average Exercise Price	$ 60
May 2024 Investor Warrants
Class of Warrant or Right [Line Items]
Equity-classified Warrants	4,029,754
Weighted-Average Exercise Price	$ 1.77
May 2024 Placement Agent Warrants
Class of Warrant or Right [Line Items]
Equity-classified Warrants	322,380
Weighted-Average Exercise Price	$ 1.89
2019 Placement Warrants
Class of Warrant or Right [Line Items]
Equity-classified Warrants		8,881	0
Weighted-Average Exercise Price	57
2020 Investor Warrants
Class of Warrant or Right [Line Items]
Equity-classified Warrants		139,882	139,882
Weighted-Average Exercise Price	44
2020 Placement Warrants
Class of Warrant or Right [Line Items]
Equity-classified Warrants		22,481	22,481
Weighted-Average Exercise Price	51
July 2021 Placement Agent Warrants
Class of Warrant or Right [Line Items]
Equity-classified Warrants		19,919	19,919
Weighted-Average Exercise Price	46.4
December 2021 Investor Warrants
Class of Warrant or Right [Line Items]
Equity-classified Warrants		107,775	107,775
Weighted-Average Exercise Price	33
December 2021 Placement Agent Warrants
Class of Warrant or Right [Line Items]
Equity-classified Warrants		8,622	8,622
Weighted-Average Exercise Price	35
March 2022 Investor Warrants
Class of Warrant or Right [Line Items]
Equity-classified Warrants		186,020	186,020
Weighted-Average Exercise Price	28
March 2022 Placement Agent Warrants
Class of Warrant or Right [Line Items]
Equity-classified Warrants		14,882	14,882
Weighted-Average Exercise Price	30
October 2023 Investor Prefunded Warrants
Class of Warrant or Right [Line Items]
Equity-classified Warrants		48,387	48,387
Weighted-Average Exercise Price	0.2
October 2023 Placement Agent Warrants
Class of Warrant or Right [Line Items]
Equity-classified Warrants		42,550	42,550
Weighted-Average Exercise Price	4.13
March 2024 Placement Agent Warrants
Class of Warrant or Right [Line Items]
Equity-classified Warrants			132,061
Weighted-Average Exercise Price	$ 1.85
Series A warrants | September 2022 Investor Warrants
Class of Warrant or Right [Line Items]
Liability-classified Warrants	755,000	755,000
Weighted-Average Exercise Price	$ 17
Series B warrants | September 2022 Investor Warrants
Class of Warrant or Right [Line Items]
Liability-classified Warrants	755,000	755,000
Weighted-Average Exercise Price	$ 17