Revenue Recognition - Product revenue (Details) - USD ($) $ in Thousands	3 Months Ended		15 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue	$ 49,742	$ 3,073
Activity in each of the product revenue allowance and reserve categories
Balance at the beginning	24,888	1,507	$ 1,507
Provision related to current period sales	6,619	1,306
Credit or payments made during the period	(11,706)	(1,913)
Balance at the end	19,801	900	19,801
Product revenue
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue	50,172	2,139
Change amount	$ 48,033
Change percentage	2246.00%
ZEJULA
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue	$ 48,869
Change amount	48,869
VARUBI/VARUBY
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue	1,303	2,139
Change amount	$ (836)
Change percentage	(39.00%)
Licenses, collaboration and other revenues
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue		934
Chargebacks, discounts and fees
Activity in each of the product revenue allowance and reserve categories
Balance at the beginning	$ 2,088	177	177
Provision related to current period sales	3,310	736
Credit or payments made during the period	(4,208)	(756)
Balance at the end	1,190	157	1,190
Government and other rebates
Activity in each of the product revenue allowance and reserve categories
Balance at the beginning	6,450	1,312	1,312
Provision related to current period sales	3,115	562
Credit or payments made during the period	(3,801)	(1,157)
Balance at the end	5,764	717	5,764
Returns
Activity in each of the product revenue allowance and reserve categories
Balance at the beginning	16,350	18	18
Provision related to current period sales	194	8
Credit or payments made during the period	(3,697)
Balance at the end	$ 12,847	$ 26	$ 12,847