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Revenue
 6 Months Ended
Jun. 30, 2023
Revenue from Contract with Customer [Abstract]  
Revenue
(3) Revenue

Revenue is recognized when control of the promised products or services is transferred to customers.

Performance Obligations

At June 30, 2023, we had $62,706 of outstanding performance obligations, comprised of deferred revenue, customer order backlog and customer deposits. We expect to recognize approximately 89.5% of the $40,172 of deferred revenue and customer deposits as revenue within the next twelve months, an additional 5.0% by the end of 2024 and the remaining balance thereafter.
Collaboration and Licensing Agreements

We enter into collaboration and licensing agreements with third parties. The nature of the activities to be performed and the consideration exchanged under these agreements varies on a contract-by-contract basis. We evaluate these agreements to determine whether they meet the definition of a customer relationship for which revenue should be recorded. These contracts may contain multiple performance obligations and may contain fees for licensing, research and development services, contingent milestone payments upon the achievement of contractual developmental criteria and/or royalty fees based on the licensees’ product revenue. We determine the revenue to be recognized for these agreements based on an evaluation of the distinct performance obligations, the identification and evaluation of material rights, the estimation of variable consideration and the determination of the pattern of transfer of control for each distinct performance obligation. During the three and six-month periods ended June 30, 2023, the Company recognized $3,463 and $8,203, respectively, of revenue related to collaboration arrangements with customers. During the three and six-month periods ended June 30, 2022, the Company recognized $3,342 and $5,774, respectively, of revenue related to collaboration arrangements with customers.

Contract Balances

During the six months ended June 30, 2023, we recognized revenue of $18,007 related to our contract liabilities at December 31, 2022. During the six months ended June 30, 2022, we recognized revenue of $20,996 related to our contract liabilities at December 31, 2021.

Contract assets, consisting of unbilled receivables, were $1,268 and $677 as of June 30, 2023 and December 31, 2022, respectively.

Revenue Concentrations

For the three and six months ended June 30, 2023, one customer accounted for approximately 18.9% and 16.3% of our consolidated revenue, respectively. For the three and six months ended June 30, 2022, one customer accounted for approximately 24.8% and 25.7% of our consolidated revenue. We expect to maintain our relationship with this customer.

Revenue by geographic region for the three and six months ended June 30, 2023 and 2022 was as follows:
Three Months Ended
(in thousands)June 30, 2023June 30, 2022
Americas$76,594 $79,807 
EMEA41,199 44,935 
APAC10,401 15,303 
Total$128,194 $140,045 
United States (included in Americas above)$75,093 $79,021 

Six Months Ended
(in thousands)June 30, 2023June 30, 2022
Americas$145,243 $154,056 
EMEA84,009 85,875 
APAC20,178 33,115 
Total$249,430 $273,046 
United States (included in Americas above)$142,878 $152,645