Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 81,425	$ 175,334
Marketable securities	79,984	0
Prepaid expenses and other assets	6,373	5,535
Total current assets	167,782	180,869
Property and equipment, net	499	511
Operating lease right-of-use assets	657	0
Investment in joint venture	415	805
Total assets	169,353	182,185
Current liabilities:
Accounts payable	1,057	603
Accrued expenses	4,595	5,948
Operating lease liabilities	148	0
Total current liabilities	5,800	6,551
Accrued expenses, noncurrent	0	32
Operating lease liabilities, noncurrent	517	0
Total liabilities	6,317	6,583
Commitments and contingencies (Note 9)
Stockholders' equity
Common stock, value	3	3
Preferred stock, value	0	0
Additional paid-in capital	271,680	269,626
Accumulated other comprehensive loss	(122)	0
Accumulated deficit	(108,525)	(94,027)
Total stockholders' equity	163,036	175,602
Total liabilities and stockholders' equity	$ 169,353	$ 182,185

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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).