Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 25,600	$ 23,081
Other current assets	277	268
Total current assets	25,877	23,349
Operating lease right-of-use assets	67	90
Property and equipment, net	33	47
Total assets	25,977	23,486
Current liabilities:
Accounts payable	608	453
Accrued development expense	387	777
Accrued compensation and benefits	72	58
Operating lease liabilities, current	67	90
Other current liabilities	11	9
Total current liabilities	1,145	1,387
Total liabilities	1,145	1,387
Commitments and contingencies
Stockholders' equity:
Preferred stock, $.001 par value; 10,000,000 shares authorized, none issued and outstanding
Common stock, $.001 par value; 120,000,000 shares authorized; 24,729,902 and 21,841,810 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	25	22
Additional paid-in capital	194,544	190,664
Accumulated deficit	(169,737)	(168,587)
Total stockholders' equity	24,832	22,099
Total liabilities and stockholders' equity	$ 25,977	$ 23,486

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).