Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 50,861	$ 23,982
Short-term investments	53,218	58,181
Prepaid expenses and other current assets	2,536	3,011
Total current assets	106,615	85,174
Property and equipment, net	223	239
Other assets	0	15
Total assets	106,838	85,428
Current liabilities:
Accounts payable	2,324	2,766
Accrued expenses	2,593	2,813
Current portion of long-term notes payable	2,500	1,666
Total current liabilities	7,417	7,245
Long-term notes payable	7,506	8,275
Other non-current liabilities	35	54
Total liabilities	14,958	15,574
Commitments and contingencies
Stockholders' equity:
Common stock, $0.0001 par value; 200,000,000 shares authorized; 29,040,270 and 24,753,102 shares issued and outstanding as of March 31, 2021 and December 31, 2020, respectively	2	2
Additional paid-in capital	172,049	141,074
Accumulated other comprehensive loss	(255)	(297)
Accumulated deficit	(79,916)	(70,925)
Total stockholders' equity	91,880	69,854
Total liabilities and stockholders' equity	$ 106,838	$ 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).

Name:	us-gaap_AccountsPayableCurrent
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).