Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 17,147	$ 24,393
Short-term investments	57,666	71,783
Prepaid expenses and other current assets	4,841	5,847
Total current assets	79,654	102,023
Property and equipment, net	488	634
Operating lease right-of-use asset	1,248	1,579
Total assets	81,390	104,236
Current liabilities:
Accounts payable	261	334
Accrued liabilities	6,449	2,951
Current portion of operating lease liability	782	741
Total current liabilities	7,492	4,026
Operating lease liability, net of current portion	605	1,007
Long-term debt, net of debt discount	9,498	9,372
Other long-term liabilities	536	552
Commitments and contingencies (Note 3)
Stockholders’ equity:
Preferred stock, $0.0001 par value; authorized shares - 10,000,000 at June 30, 2021 and December 31, 2020, respectively; issued and outstanding shares - none at June 30, 2021 and December 31, 2020, respectively.
Common stock, $0.0001 par value; authorized shares – 200,000,000 at June 30, 2021 and December 31, 2020, respectively; issued shares – 26,521,080 and 26,005,934 at June 30, 2021 and December 31, 2020, respectively; outstanding shares – 26,505,924 and 25,969,442 at June 30, 2021 and December 31, 2020, respectively.	3	3
Additional paid-in-capital	214,348	210,021
Accumulated other comprehensive income	7	1
Accumulated deficit	(151,099)	(120,746)
Total stockholders’ equity	63,259	89,279
Total liabilities and stockholders’ equity	$ 81,390	$ 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).

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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).