Unaudited condensed consolidated balance sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Accounts receivable, allowance for credit loss	$ 8	$ 11
Investments, fair value	$ 2,827	$ 15,383
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)	960,520,140	955,363,980
Ordinary shares, shares outstanding (in shares)	958,494,830	954,981,050
Treasury Stock (in shares)	2,025,310	382,930