Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 51,885	$ 9,899
Short-term investments	2,001	26,345
Prepaid expenses and other current assets	1,712	2,714
Total current assets	55,598	38,958
Right-of-use asset	1,326	2,349
Other assets	163	473
Total assets	57,087	41,780
Current liabilities:
Accounts payable	1,169	1,197
Accrued expenses	3,695	2,610
Current portion of operating lease liabilities	645	1,225
Total current liabilities	5,509	5,032
Long-term portion of operating lease liabilities	718	1,028
Total liabilities	6,227	6,060
Commitments (Note 6)
Stockholders' equity:
Preferred stock, $0.001 par value per share, 5,000,000 shares authorized and no shares issued and outstanding
Common stock, $0.001 par value per share, 150,000,000 shares authorized; 18,823,601 and 12,433,600 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	19	12
Additional paid-in capital	291,897	259,305
Accumulated other comprehensive loss	1
Accumulated deficit	(241,057)	(223,597)
Total stockholders' equity	50,860	35,720
Total liabilities and stockholders' equity	$ 57,087	$ 41,780

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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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).