Revenue Recognition - Product revenue allowance and reserve categories (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net product revenue
Sales Revenue, Goods, Net	$ 41,755	$ 1,326	$ 72,723	$ 2,844
Activity in each of the product revenue allowance and reserve categories
Balance at the beginning			1,507	1,243
Provision related to current period sales			13,646	1,946
Adjustment related to prior period sales			62
Credit or payments made during the period			(10,217)	(2,169)
Balance at the end	4,998	1,020	4,998	1,020
VARUBI/VARUBY
Net product revenue
Sales Revenue, Goods, Net	2,400	1,300	7,400	2,800
ZEJULA
Net product revenue
Sales Revenue, Goods, Net	39,400	0	65,300	0
Chargebacks, discounts and fees
Activity in each of the product revenue allowance and reserve categories
Balance at the beginning			177	813
Provision related to current period sales			6,567	1,143
Credit or payments made during the period			(5,906)	(1,622)
Balance at the end	838	334	838	334
Government and other rebates
Activity in each of the product revenue allowance and reserve categories
Balance at the beginning			1,312	422
Provision related to current period sales			6,924	798
Adjustment related to prior period sales			62
Credit or payments made during the period			(4,311)	(547)
Balance at the end	3,987	673	3,987	673
Returns
Activity in each of the product revenue allowance and reserve categories
Balance at the beginning			18	8
Provision related to current period sales			155	5
Balance at the end	$ 173	$ 13	$ 173	$ 13