CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 212,835	$ 160,358
Marketable securities	40,159	180,673
Prepaid expenses and other current assets	12,325	3,373
Total current assets	265,319	344,404
Property and equipment, net	9,564	8,121
Operating lease right-of-use asset	25,442	32,261
Restricted cash	2,498	2,498
Other long-term assets	1,622	1,021
Total assets	304,445	388,305
Current liabilities:
Accounts payable	4,434	3,409
Accrued expenses	17,456	14,958
Operating lease liability	7,407	5,366
Short-term debt	1,577
Deferred revenue	33,193	18,816
Other current liabilities	230	15
Total current liabilities	64,297	42,564
Long-term portion of operating lease liability	19,652	27,093
Long-term debt	48,422	24,680
Other long-term liabilities		5
Long-term portion of deferred revenue		33,193
Total liabilities	132,371	127,535
Commitments and contingencies (Note 11)
Stockholders' equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized at December 31, 2021 and December 31, 2020; no shares issued and outstanding at December 31, 2021 and December 31, 2020
Common stock, $0.001 par value; 150,000,000 shares authorized; 35,209,099 and 34,152,470 shares issued and outstanding as of December 31, 2021 and December 31, 2020, respectively	35	34
Additional paid-in capital	548,204	505,069
Accumulated other comprehensive loss	(35)	(2)
Accumulated deficit	(376,130)	(244,331)
Total stockholders' equity	172,074	260,770
Total liabilities and stockholders' equity	$ 304,445	$ 388,305

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).