Collaboration Revenue (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 2019 and 2018:

	Balance as of December 31, 2018		Additions		Deductions			Balance as of March 31, 2019
Three months ended March 31, 2019
Contract liabilities:
Deferred revenue - related party		137,259		—		(6,615	)		130,644
Deferred revenue		—		6,667		(260	)		6,407

	Balance as of January 1, 2018		Additions		Deductions			Balance as of March 31, 2018
Three months ended March 31, 2018
Contract liabilities:
Deferred revenue - related party		123,783		175		(3,766	)		120,192

During the three months ended March 31, 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 March 31,
	2019		2018
Revenue recognized in the period from:
Amounts included in the contract liability at the beginning    of the period		6,615		3,766