Collaboration Agreements (Tables)

3 Months Ended

Mar. 31, 2020

Collaboration agreements

Schedule of changes in the balances of our contract assets and liabilities and recognized revenue

The following table presents changes in the balances of our contract assets and liabilities during the three months ended March 31, 2020 and 2019:

	Balance at
	Beginning						Balance at
	of Period		Additions		Deductions		End of Period
Three months ended March 31, 2020
Contract assets	$	—	$	—	$	—	$	—
Contract liabilities:
Deferred revenue	$	4,815	$	—	$	11	$	4,804
	Balance at
	Beginning						Balance at
	of Period		Additions		Deductions		End of Period
Three months ended March 31, 2019
Contract assets	$	—	$	—	$	—	$	—
Contract liabilities:
Deferred revenue	$	46,196	$	—	$	40,592	$	5,604

During the three months ended March 31, 2020 and 2019, the Company recognized the following revenues as a result of changes in the contract asset and the contract liability balances in the respective periods:

	Three months ended
	March 31,
	2020		2019
Revenue recognized in the period from:
Amounts included in the contract liability at the beginning of the period	$	11	$	40,592
Performance obligations satisfied in previous periods	$	—	$	—