Collaboration Revenue (Tables)

9 Months Ended

Sep. 30, 2019

Revenue From Contract With Customer [Abstract]

Changes in Contract Assets and Contract Liabilities

The following table presents changes in the Company’s contract assets and contract liabilities during the nine months ended September 30, 2019 and 2018:

	Balance as of December 31, 2018		Additions		Deductions			Balance as of September 30, 2019
Nine months ended September 30, 2019
Contract liabilities:
Deferred revenue - related party		137,259		—		(21,909	)		115,350
Deferred revenue		—		8,383		(4,183	)		4,200

	Balance as of January 1, 2018		Additions		Deductions			Balance as of September 30, 2018
Nine months ended September 30, 2018
Contract liabilities:
Deferred revenue - related party		123,783		393		(16,721	)		107,455

During the three and nine months ended September 30, 2019 and 2018 the Company recognized the following revenues as a result of changes in the contract liabilities balances in the respective periods (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Revenue recognized in the period from:
Amounts included in the contract liability at the beginning    of the period		6,081		8,684		21,909		16,721