The Company disaggregates revenue by reportable segment and revenue recognition pattern, as it believes these categories best depicts how the nature, timing and uncertainty of revenue and cash flows are affected by economic factors. The following tables provide information about disaggregated revenue and a reconciliation of the disaggregated revenue during the years ended December 31, 2021 and 2020:


	Year Ended December 31, 2021
	Launch Services		Space Systems		Total
Revenues by recognition model
Point-in-time	$	36,576	$	12,578	$	49,154
Over-time		2,395		10,688		13,083

Total revenue by recognition model	$	38,971	$	23,266	$	62,237


	Year Ended December 31, 2020
	Launch Services		Space Systems		Total
Revenues by recognition model
Point-in-time	$	31,993	$	1,910	$	33,903
Over-time		1,092		165		1,257

Total revenue by recognition model	$	33,085	$	2,075	$	35,160

The timing of revenue recognition, billings, and cash collections results in billed accounts receivable, unbilled receivables (presented within contract assets) and customer advances and deposits (presented within contract liabilities) on the consolidated balance sheets, where applicable. Amounts are generally billed as work

progresses in accordance with agreed-upon milestones. These individual contract assets and liabilities are reported in a net position on a contract-by-contract basis on the consolidated balance sheets at the end of each reporting period.

The following table presents the balances related to enforceable contracts as of December 31, 2021 and 2020:


	December 31,
	2021		2020
Contract balances
Accounts receivable	$	13,957	$	2,730
Contract assets		2,490		2,045
Contract liabilities		59,749		26,132

Changes in contract liabilities were as follows:


	2021			2020
Contract liabilities, beginning of year	$	26,132		$	10,211
Contract liabilities assumed at acquisition		5,560			—
Customer advances received		41,614			24,694
Recognition of unearned revenue		(13,557	)		(8,773	)

Contract liabilities, end of year	$	59,749		$	26,132

The revenue recognized from the contract liabilities consisted of the Company satisfying performance obligations during the normal course of business.

The amount of revenue recognized from changes in the transaction price associated with performance obligations satisfied in prior years during the years ended December 31, 2021 and 2020 was not material.

Remaining unsatisfied performance obligations represent the total dollar value of work to be performed on contracts awarded and in progress. The amount of remaining unsatisfied performance obligations increases with new contracts or additions to existing contracts and decreases as revenue is recognized on existing contracts. Contracts are included in the amount of remaining unsatisfied performance obligations when an enforceable agreement has been reached. Remaining unsatisfied performance obligations totaled $241,463 as of December 31, 2021, of which approximately 60% is expected to be recognized within 12 months, with the remaining 40% to be recognized beyond 12 months.