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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities: |  |  |
Net loss | $ (21,948) | $ (36,280) | $ (68,208)
Adjustments to reconcile net loss to cash used in operating activities: |  |  |
Depreciation expenses | 302 | 232 | 61
Share-based compensation | 770 | 1,666 | 3,152
Non-cash operating lease expenses | 1,086 | 912 | 546
Loss on derecognition of operating right-of-use assets | 0 | 0 | 22
Paycheck Protection Program Loan Forgiveness | 0 | 0 | (635)
Disposal of property and equipment | 37 | 0 | 0
Unrealized gain on short-term investments | (4) | (19) | (144)
Change in fair value in forward contract | 0 | (1,071) | (444)
Changes in assets and liabilities: |  |  |
Short-term investments | 2,658 | 10,172 | (13,025)
Advances to suppliers | 186 | 1,243 | 1,770
Prepaid expenses and other current assets | 593 | 91 | (496)
Other noncurrent assets | (17) | 1,411 | (294)
Accounts payable | 326 | (575) | (560)
Accrued expenses | 111 | (1,388) | (1,711)
Operating lease liabilities | (966) | (1,455) | (518)
Other current liabilities | 113 | (4,669) | 2,535
Deferred revenue | 249 | (1,351) | 30,033
Other noncurrent liabilities | 30 | 2,930 | 674
Net cash used in operating activities | (16,474) | (28,151) | (47,242)
Cash flows from investing activities: |  |  |
Acquisitions of property and equipment | (100) | (34) | (2,844)
Refund from return of property and equipment | 0 | 717 | 0
Purchase of short-term available-for-sale investments | (1,300) | (32,197) | (44,232)
Sales of short-term investments | 0 | 0 | 1,663
Proceeds from maturity of short-term available-for-sale investments | 1,300 | 49,761 | 25,000
Net cash (used in) provided by investing activities | (100) | 18,247 | (20,413)
Cash flows from financing activities: |  |  |
Proceeds from issuance of contingently redeemable noncontrolling interests, net of issuance cost | 0 | 5,000 | 0
Proceeds from exercise of share options | 4 | 0 | 83
Payments of offering costs | 0 | 0 | (44)
Payments of issuance costs of contingently redeemable noncontrolling interests | 0 | 0 | (38)
Repayments of loans | 0 | (1,569) | 0
Net cash provided by financing activities | 4 | 3,431 | 1
Effect of foreign exchange rate changes | (76) | (756) | (258)
Net increase (decrease) in cash, cash equivalents and restricted cash | (16,646) | (7,229) | (67,912)
Cash, cash equivalents and restricted cash at beginning of year | 34,396 | 41,625 | 109,537
Cash, cash equivalents, and restricted cash at end of year | 17,750 | 34,396 | 41,625
Supplemental disclosures of cash flow information |  |  |
Interest paid | 0 | 17 | 91
Interest received | 462 | 136 | 98
Income taxes paid | 36 | 367 | 22
Non-cash activities: |  |  |
Operating lease right-of-use assets obtained in exchange for operating lease liabilities | 0 | 4,411 | 1,181
Operating lease right-of-use assets released in exchange for operating lease liabilities | 0 | 0 | (803)
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets: |  |  |
Cash and cash equivalents | 7,809 | 34,396 | 41,625
Restricted cash | 9,941 | 0 | 0
Total cash, cash equivalents and restricted cash | $ 17,750 | $ 34,396 | $ 41,625

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