CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Assets, Current [Abstract]
Cash and cash equivalents	$ 274,892	$ 64,179
Marketable securities	258,701	190,656
Receivable from collaboration partner	21,230
Prepaid expenses and other current assets	16,544	12,028
Total current assets	571,367	266,863
Restricted cash	2,501	2,501
Property and equipment, net	14,421	11,231
Operating lease right-of-use assets	29,645	28,659
Prepaid research and development expenses and other long-term assets	5,009	4,563
Total assets	622,943	313,817
Current liabilities:
Accounts payable	4,532	9,053
Accrued liabilities	13,997	11,679
Contract liability	107,287
Operating lease liabilities, current portion	4,947	2,901
Finance lease liabilities, current portion	35,294	33,060
Total current liabilities	166,057	56,693
Operating lease liabilities, net of current portion	31,994	31,299
Finance lease liabilities, net of current portion	15,413	20,871
Contract liability, net of current portion	105,762
Total liabilities	319,226	108,863
Commitments and contingencies (Note 7)
Stockholders' equity
Preferred stock, par value of $0.001 per share; 200,000,000 shares authorized and no shares issued and outstanding as of March 31, 2023 or December 31, 2022
Common stock, par value of $0.001 per share; 1,000,000,000 shares authorized and 47,841,388 shares issued and outstanding as of March 31, 2023; 1,000,000,000 shares authorized and 44,105,981 shares issued and outstanding as of December 31, 2022	48	44
Additional paid-in capital	649,717	523,921
Accumulated other comprehensive income (loss)	86	(221)
Accumulated Deficit	(346,134)	(318,790)
Total stockholders' equity	303,717	204,954
Total liabilities and stockholders' equity	$ 622,943	$ 313,817

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).