Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 47,976	$ 31,004
Marketable securities (Note 4)	394,442	265,198
Accounts receivable-due from related party	0	577
Contract assets-due from related party	135	856
Prepaid expenses and other current assets	8,720	4,704
Total current assets	451,273	302,339
Marketable securities, non-current (Note 4)	125,187	162,531
Property and equipment, net (Note 6)	11,881	10,841
Right-of-use assets, operating leases	9,426	9,845
Other non-current assets	2,022	30
Restricted cash	6,116	1,589
Total assets	605,905	487,175
Current liabilities:
Accounts payable	4,005	4,368
Accrued expenses (Note 8)	22,971	10,330
Deferred revenue	61,739	92,552
Operating lease liabilities	2,461	2,572
Finance lease liabilities	1,138	689
Other current liabilities	228	106
Total current liabilities	92,542	110,617
Non-current liabilities
Deferred revenue, net of current portion	39,295	77,838
Operating lease liabilities, net of current portion	13,224	14,128
Finance lease liabilities, net of current portion	1,140	604
Other non-current liabilities	66	100
Total liabilities	146,267	203,287
Commitments and contingencies (Note 9)
Stockholders’ equity (deficit):
Preferred stock, $0.0001 par value; 10,000,000 shares authorized as of December 31, 2021 and 2020; 0 shares issued and outstanding as of December 31, 2021 and 2020
Common stock, $0.0001 par value; 150,000,000 shares authorized at December 31, 2021 and 2020, 51,573,924 and 44,592,288 shares issued at December 31, 2021 and 2020, respectively; 51,536,181 and 44,482,186 shares outstanding at December 31, 2021 and 2020, respectively	5	4
Additional paid-in capital	689,275	412,777
Accumulated deficit	(228,982)	(128,765)
Accumulated other comprehensive loss	(660)	(128)
Total stockholders' equity	459,638	283,888
Total liabilities and stockholders' equity	$ 605,905	$ 487,175

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).