Revenue - Disaggregation of net revenue by product (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue
Product revenue - net	$ 36,935,000	$ 10,995,000	$ 57,038,000	$ 19,213,000
ZEJULA
Disaggregation of Revenue
Product revenue - net	23,366,000	7,446,000	35,972,000	13,791,000
Optune
Disaggregation of Revenue
Product revenue - net	9,535,000	$ 3,549,000	16,665,000	$ 5,422,000
QINLOCK
Disaggregation of Revenue
Product revenue - net	$ 4,034		$ 4,401,000