Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 73,525	$ 23,982
Short-term investments	24,118	58,181
Prepaid expenses and other current assets	1,923	3,011
Total current assets	99,566	85,174
Property and equipment, net	254	239
Other assets	17	15
Total assets	99,837	85,428
Current liabilities:
Accounts payable	1,816	2,766
Accrued expenses	3,164	2,813
Current portion of long-term notes payable		1,666
Total current liabilities	4,980	7,245
Long-term notes payable	10,067	8,275
Other non-current liabilities	17	54
Total liabilities	15,064	15,574
Commitments and contingencies
Stockholders' equity:
Common stock, $0.0001 par value; 200,000,000 shares authorized; 29,382,806 and 24,753,102 shares issued and outstanding as of June 30, 2021 and December 31, 2020, respectively	2	2
Additional paid-in capital	174,054	141,074
Accumulated other comprehensive loss	(209)	(297)
Accumulated deficit	(89,074)	(70,925)
Total stockholders' equity	84,773	69,854
Total liabilities and stockholders' equity	$ 99,837	$ 85,428

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).