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Kolltan Acquisition - Purchase Price (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Nov. 29, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2017
Acquisition-date fair value of consideration transferred
Fair value of contingent consideration		$ 44,200	$ 44,200	$ 43,400
Kolltan transaction expenses paid in cash by the Company		$ 700	$ 700
Kolltan
Kolltan Acquisition
Price of common stock (in dollars per share)	$ 4.02
Acquisition-date fair value of consideration transferred
Fair value of common stock issued for upfront payment	$ 73,397
Fair value of contingent consideration	44,200
Kolltan transaction expenses paid in cash by the Company	3,768
Total consideration transferred	$ 121,365

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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