Consolidated balance sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 1,398,498	$ 442,116
Short-term investments	170,000	744,676
Accounts receivable	21,018	5,165
Inventories	12,494	13,144
Prepayments and other current assets	17,077	10,935
Total current assets	1,619,087	1,216,036
Restricted cash, non-current	743	743
Long term investments (including the fair value measured investment of $20,070 and nil as of September 30, 2021 and December 31, 2020, respectively)	20,801	1,279
Prepayments for equipment	1,129	274
Property and equipment, net	37,087	29,162
Operating lease right-of-use assets	15,514	17,701
Land use rights, net	7,749	7,908
Intangible assets, net	1,678	1,532
Long term deposits	901	862
Value added tax recoverable	23,390	22,141
Total assets	1,728,079	1,297,638
Current liabilities:
Accounts payable	51,406	62,641
Current operating lease liabilities	6,312	5,206
Other current liabilities	54,292	30,196
Total current liabilities	112,010	98,043
Deferred income	17,487	16,858
Non-current operating lease liabilities	10,652	13,392
Total liabilities	140,149	128,293
Commitments and contingencies
Shareholders' equity
Ordinary shares (par value of $0.00006 per share; 500,000,000 shares authorized, 95,273,589 and 87,811,026 shares issued and outstanding as of September 30,2021 and December 31, 2020, respectively)	6	5
Additional paid-in capital	2,812,830	1,897,467
Accumulated deficit	(1,206,249)	(713,603)
Accumulated other comprehensive loss	(15,124)	(14,524)
Treasury Stock	(3,533)
Total shareholders' equity	1,587,930	1,169,345
Total liabilities and shareholders' equity	$ 1,728,079	$ 1,297,638