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Revenue | 6 Months Ended
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Jun. 30, 2023
Revenue |
Revenue | Note 4. Revenue ​ To reflect the organization of our business operations, we divide revenue into two categories: revenue from sales of new systems and revenue arising from the sale of used systems, parts and labor to customers who own systems, which we refer to as “Aftermarket.” ​ Revenue by categories used by management are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
​ | ​ | 2023 | ​ | 2022 | ​ | 2023 | ​ | 2022
​ | ​ | (in thousands)
Systems | ​ | $ | 215,174 | ​ | $ | 165,350 | ​ | $ | 410,372 | ​ | $ | 317,152
Aftermarket | ​ | ​ | 58,796 | ​ | ​ | 55,827 | ​ | ​ | 117,618 | ​ | ​ | 107,620
Total Revenue | ​ | $ | 273,970 | ​ | $ | 221,177 | ​ | $ | 527,990 | ​ | $ | 424,772
​ We also consider revenue by geography. Revenue is allocated to geographic markets based upon the location to which our products are shipped and in which our services are performed. Revenue in our principal geographic markets is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
​ | ​ | 2023 | ​ | 2022 | ​ | 2023 | ​ | 2022
​ | ​ | (in thousands)
North America | ​ | $ | 37,918 | ​ | $ | 34,683 | ​ | $ | 83,084 | ​ | $ | 59,596
Asia Pacific | ​ | ​ | 205,941 | ​ | ​ | 168,705 | ​ | ​ | 397,044 | ​ | ​ | 317,945
Europe | ​ | ​ | 30,111 | ​ | ​ | 17,789 | ​ | ​ | 47,862 | ​ | ​ | 47,231
Total Revenue | ​ | $ | 273,970 | ​ | $ | 221,177 | ​ | $ | 527,990 | ​ | $ | 424,772
​ Our system sales revenue transactions give rise to contract liabilities (in the case of pre-payments and the fair value of goods and services to be delivered after the system delivery, such as installation and certain warranty obligations). ​ Contract liabilities are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ | ​ | 2023 | ​ | 2022
​ | ​ | (in thousands)
Contract liabilities | ​ | $ | 182,540 | ​ | $ | 154,777
​ | ​ | ​ | ​ | ​ | ​ | ​
Contract liabilities are reflected as deferred revenue on the consolidated balance sheet and relate to payments invoiced or received in advance of completion of performance obligations under a contract. Contract liabilities are recognized as revenue upon the fulfillment of performance obligations. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, |  | June 30,
​ | ​ | 2023 | ​ | 2022 | ​ | 2023 | ​ | 2022
​ | ​ | (in thousands)
Balance, beginning of the period | ​ | $ | 201,725 | ​ | $ | 74,840 | ​ | $ | 154,777 | ​ | $ | 68,436
Deferral of revenue | ​ | ​ | 34,977 | ​ | ​ | 28,703 | ​ | ​ | 107,556 | ​ | ​ | 46,697
Recognition of deferred revenue | ​ | ​ | (54,162) | ​ | ​ | (31,994) | ​ | ​ | (79,793) | ​ | ​ | (43,584)
Balance, end of the period | ​ | $ | 182,540 | ​ | $ | 71,549 | ​ | $ | 182,540 | ​ | $ | 71,549
​ The majority of our system transactions have either (1) payment terms of 90% due upon shipment of the system and 10% due upon acceptance or (2) a deposit with the remaining balance due at shipment and acceptance. Aftermarket transaction payment terms typically provide that payment is due either within 30 or 60 days after the service is provided or parts delivered.

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