Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 16,615	$ 31,299
Marketable securities	2,099
Other current assets	356	392
Total current assets	19,070	31,691
Property and equipment, net	232	215
Other assets		12
Total assets	19,302	31,918
Current liabilities:
Accounts payable	303	1,034
Accrued development expense	27	894
Accrued compensation and benefits	335	623
Total current liabilities	665	2,551
Noncurrent liabilities
Total liabilities	665	2,551
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; 46,141,935 and 45,756,117 shares issued and outstanding at December 31, 2016 and 2015, respectively	46	46
Additional paid-in capital	164,079	159,959
Accumulated other comprehensive income
Accumulated deficit	(145,488)	(130,638)
Total stockholders' equity	18,637	29,367
Total liabilities and stockholders' equity	$ 19,302	$ 31,918

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).