Share-Based Payments - 2020 Share Incentive Plan (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2020 USD ($)	Dec. 31, 2020 tranche $ / shares shares	Mar. 04, 2020 shares
Fair Value Assumptions
Expected volatility (as a percent)			77.30%
Expected term of options (in years)			5 years 6 months
Risk-free interest rate (as a percent)			1.00%
2020 Share Incentive Plan
Share-Based Payments
Options granted during the period			21,000
Exercise price (in dollars per share) | $ / shares			$ 1.39
Options
Outstanding at beginning of year (in shares)			296,805
Granted (in shares)			21,000
Forfeited (in shares)			(107,325)
Outstanding at end of year (in shares)	210,480		210,480		296,805
Weighted average exercise price in $ per share
Outstanding balance at beginning of year (in dollars per share) | $ / shares			$ 10.18
Granted (in dollars per share) | $ / shares			1.39
Forfeited (in dollars per share) | $ / shares			5.70
Outstanding balance at end of year (in dollars per share) | $ / shares	$ 9.87		$ 9.87		$ 10.18
Additional disclosures
Weighted-average remaining contractual life			7 years 10 months 24 days
Total unrecognized compensation related to unvested options | $	$ 600		$ 600
Minimum
Fair Value Assumptions
Expected volatility (as a percent)			75.30%
Risk-free interest rate (as a percent)			1.02%
Maximum
Fair Value Assumptions
Expected volatility (as a percent)			76.30%
Risk-free interest rate (as a percent)			1.16%
Ordinary Shares | 2020 Share Incentive Plan
Share-Based Payments
Shares reserved for future issuance	657,575		657,575
Ordinary Shares | Maximum | 2020 Share Incentive Plan
Share-Based Payments
Shares reserved for future issuance						930,000
Stock Options
Share-Based Payments
Share-based compensation expense | $	$ 100	$ 51	$ 200	$ 65
Stock Options | 2020 Share Incentive Plan
Weighted average exercise price in $ per share
Weighted-average grant date fair value (in dollars per share) | $ / shares			$ 0.90
Additional disclosures
Recognition period			1 year 6 months
Restricted Stock Units ("RSUs") | 2020 Share Incentive Plan | Employees
Share-Based Payments
Options granted during the period					45,977
Number of vesting periods | tranche					3
Vesting period					6 months
Grant date fair value | $ / shares					$ 7.88
Options
Granted (in shares)					45,977
Restricted Stock Units ("RSUs") | 2020 Share Incentive Plan | Certain Employees
Share-Based Payments
Restricted stock granted during the period			341,935
Restricted Stock Units ("RSUs") | 2020 Share Incentive Plan | Chief Executive Officer
Share-Based Payments
Restricted stock granted during the period			7,000
Percentage that vests during the period			50.00%
Performance Based Restricted Stock Unit | 2020 Share Incentive Plan | Employees
Share-Based Payments
Options granted during the period					43,125
Share-based compensation expense | $	200		$ 300
Grant date fair value | $ / shares					$ 5.30
Options
Granted (in shares)					43,125
Additional disclosures
Total unrecognized compensation related to unvested RSUs | $	$ 1,300		$ 1,300
Recognition period			2 years