Quarterly report pursuant to Section 13 or 15(d)

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)

v3.19.3
UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)
$ in Thousands
Sep. 30, 2019
£ / shares
Sep. 30, 2019
USD ($)
shares
Dec. 31, 2018
£ / shares
Dec. 31, 2018
USD ($)
shares
UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS        
Allowance for doubtful accounts | $   $ 0   $ 0
Property, plant and equipment, accumulated depreciation | $   $ 20,818   $ 15,924
Common stock, par value | £ / shares £ 0.001   £ 0.001  
Common stock, shares authorized   785,857,300   701,103,126
Common stock, shares issued   630,952,736   627,454,270
Common stock, shares outstanding   630,952,736   627,454,270