Financial Statements Schedule I - Condensed Balance Sheets (Details) - USD ($)	Dec. 31, 2022	Mar. 30, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 1,008,470,000		$ 964,100,000	$ 442,116,000
Short-term investments	0		445,000,000
Prepayments and other current assets	35,674,000		18,021,000
Total current assets	1,124,336,000		1,500,881,000
Total assets	1,220,140,000		1,609,956,000
Current liabilities
Other current liabilities	66,818,000		60,811,000
Total current liabilities	139,842,000		192,901,000
Deferred income	21,360,000		27,486,000
Total liabilities	174,545,000		230,000,000
Shareholders’ equity
Ordinary shares (par value of $0.000006 per share; 5,000,000,000 shares authorized, 962,455,850 and 955,363,980 shares issued as of December 31, 2022 and 2021, respectively; 960,219,570 and 954,981,050 shares issued and outstanding as of December 31, 2022 and 2021, respectively)	6,000		6,000
Additional paid-in capital	2,893,120,000		2,825,948,000
Accumulated deficit	(1,861,360,000)		(1,418,074,000)
Accumulated other comprehensive income (loss)	25,685,000		(23,645,000)
Treasury stock	(11,856,000)		(4,279,000)
Total shareholders’ equity	1,045,595,000		1,379,956,000	$ 1,169,345,000	$ 294,660,000
Total liabilities and shareholders’ equity	$ 1,220,140,000		$ 1,609,956,000
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 outstanding (in shares)	960,219,570		954,981,050
Ordinary shares, shares issued (in shares)	962,455,850		955,363,980
Parent Company
Current assets
Cash and cash equivalents	$ 944,649,000		$ 591,842,000
Short-term investments	0		445,000,000
Prepayments and other current assets	10,203,000		2,364,000
Total current assets	954,852,000		1,039,206,000
Investment in subsidiaries	93,363,000		341,980,000
Total assets	1,048,215,000		1,381,186,000
Current liabilities
Other current liabilities	2,620,000		996,000
Total current liabilities	2,620,000		996,000
Deferred income	0		234,000
Total liabilities	2,620,000		1,230,000
Shareholders’ equity
Ordinary shares (par value of $0.000006 per share; 5,000,000,000 shares authorized, 962,455,850 and 955,363,980 shares issued as of December 31, 2022 and 2021, respectively; 960,219,570 and 954,981,050 shares issued and outstanding as of December 31, 2022 and 2021, respectively)	6,000		6,000
Additional paid-in capital	2,893,120,000		2,825,948,000
Accumulated deficit	(1,861,360,000)		(1,418,074,000)
Accumulated other comprehensive income (loss)	25,685,000		(23,645,000)
Treasury stock	(11,856,000)		(4,279,000)
Total shareholders’ equity	1,045,595,000		1,379,956,000
Total liabilities and shareholders’ equity	$ 1,048,215,000		$ 1,381,186,000
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 outstanding (in shares)	960,219,570		954,981,050
Ordinary shares, shares issued (in shares)	962,455,850		955,363,980