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
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2021
£ / shares
Dec. 31, 2020
USD ($)
shares
UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS      
Property, plant and equipment, accumulated depreciation | $ $ 32,703   $ 31,097
Common stock, par value | £ / shares   £ 0.001  
Common stock, shares authorized 1,038,249,630   1,038,249,630
Common stock, shares issued 932,817,168   928,754,958
Common stock, shares outstanding 932,817,168   928,754,958