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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net loss $ (68,208) $ (63,821) $ (40,333)
Adjustments to reconcile net loss to cash used in operating activities:      
Depreciation expenses 61 77 77
Share-based compensation 3,152 8,194 2,101
Non-cash operating lease expenses 546 659 650
Loss on derecognition of right-of-use assets 22 0 0
Paycheck Protection Program Loan Forgiveness (635) 0 0
Unrealized gain on short-term investments (144) 0 0
Change in fair value in forward contract (444) 0 0
Changes in assets and liabilities:      
Short-term investments (13,025) 0 0
Advances to suppliers 1,770 1,014 (3,310)
Due from related parties 0 0 481
Prepaid expenses and other current assets (496) 52 (137)
Other noncurrent assets (294) (334) (36)
Accounts payable (560) (321) (7,049)
Accrued expenses (1,711) (291) 366
Operating lease liabilities (518) (621) (697)
Other current liabilities 2,535 2,372 (275)
Deferred revenue 30,033 9,275 0
Other noncurrent liabilities 674 0 0
Net cash used in operating activities (47,242) (43,745) (48,162)
Cash flows from investing activities:      
Acquisitions of property and equipment (2,844) (52) (4)
Purchase of short-term investments (44,232) 0 0
Sale of short-term investments 1,663 0 0
Proceed from maturity of short-term investments 25,000 0 0
Net cash used in investing activities (20,413) (52) (4)
Cash flows from financing activities:      
Proceeds from issuance of ordinary shares, net of underwriting discounts and commissions 0 112,577 69,454
Proceeds from issuance of contingently redeemable noncontrolling interests, net of issuance cost 0 5,233 0
Capital contribution from noncontrolling interests 0 80 10,083
Proceeds from issuance of forward contract 0 278 0
Proceeds from exercise of share options 83 0 0
Payments of offering costs (44) (939) (888)
Payments of issuance costs of contingently redeemable noncontrolling interests (38) 0 0
Proceeds from loans 0 635 2,986
Proceeds from related party borrowings 0 35 5,894
Repayments of loans 0 0 (1,493)
Repayment of related party borrowings 0 (64) (5,865)
Net cash provided by financing activities 1 117,835 80,171
Effect of foreign exchange rate changes (258) (434) 39
Net increase (decrease) in cash and cash equivalents (67,912) 73,604 32,044
Cash and cash equivalents at beginning of year 109,537 35,933 3,889
Cash and cash equivalents at end of year 41,625 109,537 35,933
Supplemental disclosures of cash flow information      
Interest paid 91 85 202
Interest received 98 166 131
Non-cash activities:      
Operating lease right-of-use assets obtained in exchange for operating lease liabilities 1,181 295 0
Operating lease right-of-use assets released in exchange for operating lease liabilities $ (803) $ 0 $ 0