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

In thousands		Balance at Beginning of Period		Additions		Deductions		Balance at End of Period
Nine months ended September 30, 2018:
Contract assets	$	—	$	—	$	—	$	—
Contract liabilities:
Deferred revenue	$	19,054	$	2,500	$	(598)	$	20,956

During the nine months ended September 30, 2018, the Company recognized the following revenues as a result of changes in the contract asset and contract liability balances in the respective periods:

In thousands	Nine Months Ended September 30,
Revenue recognized in the period from:	2018
Amounts included in contract liability at the beginning of the period	$	405
Performance obligations satisfied in previous periods	$	193