XML 33 R6.htm IDEA: XBRL DOCUMENT v3.24.1.u1
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