Schedule I — Condensed Financial Information of Registrant - Condensed Balance Sheets (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Mar. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 790,151	$ 1,008,470		$ 964,100
Prepayments and other current assets	22,995	35,674
Total current assets	939,606	1,124,336
Total assets	1,036,295	1,220,140
Current liabilities
Other current liabilities	82,972	66,818
Total current liabilities	203,067	139,842
Total liabilities	240,177	174,545
Shareholders’ equity
Ordinary shares (par value of $0.000006 per share; 5,000,000,000 shares authorized, 977,151,270 and 962,455,850 shares issued as of December 31, 2023 and 2022, respectively; 972,239,070 and 960,219,570 shares issued and outstanding as of December 31, 2023 and 2022, respectively)	6	6
Additional paid-in capital	2,975,302	2,893,120
Accumulated deficit	(2,195,980)	(1,861,360)
Accumulated other comprehensive income	37,626	25,685
Treasury stock	(20,836)	(11,856)
Total shareholders’ equity	796,118	1,045,595		$ 1,379,956	$ 1,169,345
Total liabilities and shareholders’ equity	$ 1,036,295	$ 1,220,140
Stockholders' equity, par value and number of shares
Ordinary shares, par value (in dollars per share)	$ 0.000006	$ 0.000006	$ 0.000006
Ordinary shares, shares authorized (in shares)	5,000,000,000	5,000,000,000	5,000,000,000
Ordinary shares, shares issued (in shares)	977,151,270	962,455,850
Ordinary shares, shares outstanding (in shares)	972,239,070	960,219,570
Parent Company
Current assets
Cash and cash equivalents	$ 565,981	$ 944,649
Prepayments and other current assets	7,423	10,203
Total current assets	573,404	954,852
Investment in subsidiaries	224,954	93,363
Total assets	798,358	1,048,215
Current liabilities
Other current liabilities	2,240	2,620
Total current liabilities	2,240	2,620
Total liabilities	2,240	2,620
Shareholders’ equity
Ordinary shares (par value of $0.000006 per share; 5,000,000,000 shares authorized, 977,151,270 and 962,455,850 shares issued as of December 31, 2023 and 2022, respectively; 972,239,070 and 960,219,570 shares issued and outstanding as of December 31, 2023 and 2022, respectively)	6	6
Additional paid-in capital	2,975,302	2,893,120
Accumulated deficit	(2,195,980)	(1,861,360)
Accumulated other comprehensive income	37,626	25,685
Treasury stock	(20,836)	(11,856)
Total shareholders’ equity	796,118	1,045,595
Total liabilities and shareholders’ equity	$ 798,358	$ 1,048,215
Stockholders' equity, par value and number of shares
Ordinary shares, par value (in dollars per share)	$ 0.000006	$ 0.000006
Ordinary shares, shares authorized (in shares)	5,000,000,000	5,000,000,000
Ordinary shares, shares issued (in shares)	977,151,270	962,455,850
Ordinary shares, shares outstanding (in shares)	972,239,070	960,219,570