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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Operating activities              
Net loss $ (8,759) $ (2,484) $ (8,497) $ (19,257) $ (11,243) $ (27,754)  
Adjustments to reconcile net loss to cash used in operating activities:              
Share-based compensation         4,251 4,887  
Depreciation and amortization         3,244 4,785  
Impairment loss on long-lived assets         1,974 205  
Impairment loss on other investments 12,916   0   25,650 0  
Loss from investments         3,732 2,955  
Changes in expected credit losses on long-term financial assets         1,021 (1,146)  
Foreign currency transaction (gain) loss (6,543)   3,174   (19,802) 4,817  
Other non-cash operating activities, net         829 (554)  
Changes in operating assets and liabilities:              
Accounts receivable, net         (2,723) 10,623  
Interest receivable         1,174 (10,243)  
Other receivables         (1,009) (200)  
Prepaids and other current assets         (5) 480  
Inventory         292 (7,259)  
Accounts payable         (4,482) (2,478)  
Income taxes payable         (47) (32,801)  
Accrued liabilities         (3,316) (5,784)  
Cash flows used in operating activities         (460) (59,467)  
Investing activities              
Purchase of short-term investments         0 (479,763)  
Proceeds from short-term investments         187,447 169,418  
Dividends received from equity method investment         0 1,299  
Advances on loans receivable         (8,836) 0  
Proceeds from repayment on loans receivable         5,298 11,388  
Purchase of property, plant and equipment         (2,453) (1,298)  
Purchase of intangible assets         (457) (8)  
Cash flows provided by (used in) investing activities         180,999 (298,964)  
Financing activities              
Withholding taxes paid on share-based awards         (905) (782)  
Cash flows used in financing activities         (905) (782)  
Effect of foreign currency translation on cash and cash equivalents         (736) 3,997  
Net change in cash and cash equivalents         178,898 (355,216)  
Cash and cash equivalents, beginning of period   $ 669,291   $ 764,644 669,291 764,644 $ 764,644
Cash and cash equivalents, end of period $ 848,189   $ 409,428   848,189 409,428 $ 669,291
Supplemental cash flow information              
Interest paid         0 0  
Interest received         28,291 13,385  
Income taxes paid         $ 614 $ 32,995