Unaudited condensed consolidated balance sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 680,820	$ 964,100
Short-term investments	575,274	445,000
Accounts receivable (net of allowance for credit loss of $8 and $11 as of June 30, 2022 and December 31, 2021, respectively)	27,054	47,474
Notes receivable	10,968	7,335
Inventories, net	23,339	18,951
Value added tax recoverable - current	219	0
Prepayments and other current assets	17,973	18,021
Total current assets	1,335,647	1,500,881
Restricted cash, non-current	803	803
Long term investments (including the fair value measured investment of $2,827 and $15,383 as of June 30, 2022 and December 31, 2021, respectively)	2,827	15,605
Prepayments for equipment	4,542	989
Property and equipment, net	46,419	43,102
Operating lease right-of-use assets	18,596	14,189
Land use rights, net	7,286	7,811
Intangible assets, net	1,673	1,848
Long-term deposits	947	870
Value added tax recoverable	37	23,858
Total assets	1,418,777	1,609,956
Current liabilities:
Accounts payable	108,443	126,163
Current operating lease liabilities	6,824	5,927
Other current liabilities	53,610	60,811
Total current liabilities	168,877	192,901
Deferred income	24,775	27,486
Non-current operating lease liabilities	12,960	9,613
Total liabilities	206,612	230,000
Commitments and contingencies (Note 14)
Shareholders’ equity
Ordinary shares (par value of $0.000006 per share; 5,000,000,000 shares authorized; 960,520,140 and 955,363,980 shares issued as of June 30, 2022 and December 31, 2021, respectively; 958,494,830 and 954,981,050 shares outstanding as of June 30, 2022 and December 31, 2021, respectively)	6	6
Additional paid-in capital	2,857,202	2,825,948
Accumulated deficit	(1,638,401)	(1,418,074)
Accumulated other comprehensive income (loss)	4,487	(23,645)
Treasury Stock (at cost, 2,025,310 and 382,930 shares as of June 30, 2022 and December 31, 2021, respectively)	(11,129)	(4,279)
Total shareholders’ equity	1,212,165	1,379,956
Total liabilities and shareholders’ equity	$ 1,418,777	$ 1,609,956