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Debt (Details) $ in Thousands, £ in Millions		1 Months Ended			2 Months Ended	5 Months Ended	6 Months Ended
Debt (Details) $ in Thousands, £ in Millions	Jan. 29, 2021 shares	Dec. 31, 2020 USD ($)	Nov. 30, 2020 GBP (£)	Jul. 31, 2019 GBP (£)	Mar. 31, 2021 USD ($) shares	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)
Debt Instrument [Line Items]
Financing term		6 months
Conversion price, discount percentage, next qualified fundraising							20.00%
Conversion price, discount percentage, change in control							50.00%
Aggregate debt discounts						$ 700	$ 700
Forgiveness of convertible term loan					$ 6,199	$ 6,200
Series A Preferred \| Preferred Stock
Debt Instrument [Line Items]
Issuance of Series A convertible preferred shares upon conversion of debt (in shares) \| shares	568,181				568,181
Unsecured Convertible Term Notes Due June 2021 \| Convertible Notes Payable
Debt Instrument [Line Items]
Face amount		$ 5,000
Stated interest rate		8.00%
Convertible Term Notes Due August 2021
Debt Instrument [Line Items]
Proceeds from convertible debt \| £			£ 1.0	£ 3.0
Convertible Term Notes Due August 2021 \| Convertible Notes Payable
Debt Instrument [Line Items]
Face amount \| £				£ 5.0
Stated interest rate				2.00%