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Deferred Revenue (Tables) | 12 Months Ended
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Dec. 31, 2023
Deferred Revenue. |
Summary of deferred revenue | ​
​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2022 |  | 2023
​ | ​ | US$ | ​ | US$
Deferred Revenue | ​ |  |  |
-Cloud-based connectivity and basic IoT services (1) | ​ | 1,375 |  | 1,122
-Membership (2) | ​ | 672 |  | —
-SaaS (3) | ​ | 5,168 |  | 6,186
Total deferred revenue | ​ | 7,215 |  | 7,308
| (1) | Deferred cloud-based connectivity and basic IoT services related revenue
Deferred cloud-based connectivity and basic IoT services related revenue represents the Group’s provision of cloud-based connectivity obligation and basic IoT services to customers.
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2021 |  | 2022 |  | 2023
​ | ​ | US$ | ​ | US$ | ​ | US$
Beginning balances |  | 2,058 |  | 2,669 | ​ | 1,375
Deferral of revenue |  | 2,157 |  | 872 | ​ | 984
Recognition of deferred revenue |  | (1,546) |  | (2,166) | ​ | (1,237)
Ending balances |  | 2,669 |  | 1,375 | ​ | 1,122
(2)Deferred Revenue-Membership Deferred Revenue-Membership represents the Group’s remaining performance obligation performed over the period of time under its 2020 Membership Program (Note 2(q)).
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2021 |  | 2022 |  | 2023
​ | ​ | US$ | ​ | US$ | ​ | US$
Beginning balances |  | 1,077 |  | 3,473 | ​ | 672
Deferral of revenue |  | 9,259 |  | 2,442 | ​ | 179
Recognition of deferred revenue |  | (6,863) |  | (5,243) | ​ | (851)
Ending balances |  | 3,473 |  | 672 | ​ | —
| (3) | Deferred Revenue-SaaS
Deferred Revenue-SaaS mainly represents the Group’s remaining performance obligation in providing industry SaaS services over the period of time (Note 2(q)).
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2021 |  | 2022 |  | 2023
​ | ​ | US$ | ​ | US$ | ​ | US$
Beginning balances |  | 1,040 |  | 3,971 | ​ | 5,168
Deferral of revenue |  | 6,455 |  | 11,779 | ​ | 19,402
Recognition of deferred revenue |  | (3,524) |  | (10,582) | ​ | (18,384)
Ending balances |  | 3,971 |  | 5,168 | ​ | 6,186
​

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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