CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets, Current [Abstract]
Cash and cash equivalents	$ 127,160	$ 30,833
Marketable securities	83,769	73,784
Prepaid expenses and other current assets	13,460	8,192
Total current assets	224,389	112,809
Restricted cash	199	199
Property and equipment, net	9,747	10,318
Operating lease right-of-use assets	3,248
Deferred offering costs		3,172
Prepaid research and development expenses and other long-term assets	9,401	2,284
Total assets	246,984	128,782
Current liabilities:
Accounts payable	1,874	1,333
Accrued liabilities	11,650	13,180
Operating lease liabilities, current portion	737
Deferred rent, current portion		183
Other current liabilities	164	149
Total current liabilities	14,425	14,845
Operating lease liabilities, net of current portion	4,477
Deferred Rent Credit, Noncurrent		1,895
Other Liabilities, Noncurrent	147	178
Total liabilities	19,049	16,918
Redeemable convertible preferred stock:
Redeemable convertible preferred stock		233,379
Stockholders' equity (deficit):
Preferred stock, par value of $0.001 per share; 200,000,000 shares authorized, and no shares issued and outstanding as of March 31, 2022; no shares authorized, issued or outstanding as of December 31, 2021
Common stock, par value of $0.001 per share; 1,000,000,000 shares authorized and 35,718,764 shares issued and outstanding as of March 31, 2022; 185,000,000 shares authorized and 544,210 shares issued and outstanding as of December 31, 2021	36	1
Additional paid-in capital	384,095	8,615
Accumulated other comprehensive loss	(44)	(20)
Accumulated Deficit	(156,152)	(130,111)
Total stockholders' equity (deficit)	227,935	(121,515)
Total liabilities, redeemable convertible preferred stock, and stockholders' equity (deficit)	$ 246,984	128,782
Series A Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock:
Redeemable convertible preferred stock		28,894
Series B Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock:
Redeemable convertible preferred stock		85,367
Series C Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock:
Redeemable convertible preferred stock		$ 119,118

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).