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License agreements - MorphoSys (Details) $ / shares in Units, $ in Thousands, € in Millions		1 Months Ended		3 Months Ended		9 Months Ended
	Mar. 03, 2020 USD ($) $ / shares	Mar. 31, 2020 EUR (€)	Jan. 31, 2020 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Unrealized gain (loss) on long term investments				$ (13,207)	$ 2,339	$ 10,935	$ 18,703
Long term investments				222,810		222,810		$ 133,657
Research and development expense				438,109	$ 281,336	1,809,997	$ 841,244
Collaboration loss sharing				14,989		30,372
ADSs
Equity Method Investment, Ownership Percentage			25.00%
Equity Method Investment, Aggregate Cost			$ 150,000
Per share price | $ / shares	$ 27.65		$ 41.33
Lock-up period			18 months
Discount for lack of marketability	$ 4,900
Fair value of shares	95,500
Long term investments	95,500			$ 113,900		$ 113,900
Research and development expense	$ 54,500
MorphoSys AG
Upfront payment under license agreement | €		€ 750.0
Equity Method Investment, Ownership Percentage				3.00%		3.00%
Unrealized gain (loss) on long term investments				$ 900		$ 18,500
Research and development expense				23,800		$ 51,100
Associated future global development costs from the initiation of a Phase IIb trial, if elected to co-develop (as a percentage)						55.00%
Accrued and other liabilities				46,800		$ 46,800
Profit (loss) sharing ratio						50.00%
Collaboration loss sharing				$ 15,000		$ 30,400
MorphoSys AG | Development and Regulatory Milestones | Maximum
Additional milestone payments under the license agreement			$ 740,000
MorphoSys AG | Sales and Commercial Milestones | Maximum
Additional milestone payments under the license agreement			$ 315,000
MorphoSys AG | MorphoSys AG
Funding of future development costs (as a percent)						45.00%
MorphoSys AG | Incyte
Funding of future development costs (as a percent)						55.00%

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