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Contract Assets and Contract Liabilities
 9 Months Ended
Sep. 30, 2023
Revenue from Contract with Customer [Abstract]  
Contract Assets and Contract Liabilities Contract Assets and Contract Liabilities
Contract assets and liabilities are reflected in the Company’s condensed consolidated balance sheets within the accounts reflected below.
Contract Assets
Accounts receivable represent amounts due from the Company’s customers who are concentrated primarily in the pharmaceutical, biotechnology, and medical device industries. Unbilled represents revenue recognized to date that has not been billed or is not yet contractually billable to the customer. In general, amounts become billable upon the achievement of negotiated contractual events, in accordance with predetermined payment schedules or when a reimbursable expense has been incurred. Amounts classified to unbilled are those billable to customers within one year from the respective balance sheet date.
Accounts receivable and unbilled, net consisted of the following (in thousands):
As of
September 30,
2023		December 31,
2022
Accounts receivable$257,294 $213,169 
Unbilled receivables35,486 40,405 
Less: allowance for doubtful accounts(7)(170)
Total accounts receivable and unbilled, net$292,773 $253,404 
Contract Liabilities
Advanced billings represent cash received from customers, or billed amounts per an agreed upon payment schedule, in advance of services being performed or revenue being recognized.
Advanced billings consisted of the following (in thousands):
As of
September 30,
2023		December 31,
2022
Advanced billings$518,755 $462,729 
As of September 30, 2023, we had approximately $2.8 billion of performance obligations remaining to be performed for active projects.