Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 19,457	$ 24,393
Short-term investments	65,000	71,783
Prepaid expenses and other current assets	6,257	5,847
Total current assets	90,714	102,023
Property and equipment, net	555	634
Operating lease right-of-use asset	1,415	1,579
Total assets	92,684	104,236
Current liabilities:
Accounts payable	325	334
Accrued liabilities	4,149	2,951
Current portion of operating lease liability	762	741
Total current liabilities	5,236	4,026
Operating lease liability, net of current portion	810	1,007
Long-term debt, net of debt discount	9,434	9,372
Other long-term liabilities	544	552
Commitments and contingencies (Note 3)
Stockholders’ equity:
Preferred stock, $0.0001 par value; authorized shares - 10,000,000 at March 31, 2021 and December 31, 2020, respectively; issued and outstanding shares - none at March 31, 2021 and December 31, 2020, respectively.
Common stock, $0.0001 par value; authorized shares – 200,000,000 at March 31, 2021 and December 31, 2020, respectively; issued shares – 26,234,612 and 26,005,934 at March 31, 2021 and December 31, 2020, respectively; outstanding shares – 26,209,327 and 25,969,442 at March 31, 2021 and December 31, 2020, respectively.	3	3
Additional paid-in-capital	212,172	210,021
Accumulated other comprehensive income (loss)	(1)	1
Accumulated deficit	(135,514)	(120,746)
Total stockholders’ equity	76,660	89,279
Total liabilities and stockholders’ equity	$ 92,684	$ 104,236

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).