Quarterly report pursuant to Section 13 or 15(d)

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)

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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Mar. 31, 2022
£ / shares
Dec. 31, 2021
£ / shares
UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS        
Allowance for doubtful accounts | $ $ 0 $ 0    
Property, plant and equipment, accumulated depreciation | $ 36,671 36,253    
Intangible assets, net of accumulated amortization | $ $ 4,209 $ 4,051    
Common stock, par value | £ / shares     £ 0.001 £ 0.001
Common stock, shares authorized | shares 1,240,853,520 1,240,853,520    
Common stock, shares issued | shares 940,866,006 937,547,934    
Common stock, shares outstanding | shares 940,866,006 937,547,934