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CONTRACT ASSETS AND CONTRACT LIABILITIES | 12 Months Ended
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Dec. 31, 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 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 at December 31 (in thousands):
| 2023 |  | 2022
Accounts receivable | $ | 275,932 |  |  | $ | 213,169 |
Unbilled receivables | 22,475 |  |  | 40,405 |
Less: allowance for doubtful accounts | (7) |  |  | (170) |
Total accounts receivable and unbilled, net | $ | 298,400 |  |  | $ | 253,404 |
Contract Liabilities Advanced billings represents cash received from customers, or billed amounts per an agreed upon payment schedule, in advance of services being performed or revenue being recognized. During the year ended December 31, 2023, the Company recognized approximately $396.3 million of revenue that was included in the Advanced billings balance at the beginning of the year. Advanced billings consisted of the following at December 31 (in thousands):
| 2023 |  | 2022
Advanced billings | $ | 559,860 |  |  | $ | 462,729 |
A rollforward of allowance for doubtful account activity is as follows:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Allowance for doubtful accounts - beginning balance | $ | (170) |  |  | $ | (171) |  |  | $ | (346) |
Current year provision | (3,420) |  |  | — |  |  | (11) |
Write-offs, recoveries and the effects of foreign currency exchange | 3,583 |  |  | 1 |  |  | 186 |
Allowance for doubtful accounts - ending balance | $ | (7) |  |  | $ | (170) |  |  | $ | (171) |

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-9 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-10 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-15 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-13 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Topic 606 -Publisher FASB -URI https://asc.fasb.org//606/tableOfContent + Details
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