CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 17,115	$ 20,440
Prepaid expenses and other current assets	4,120	4,051
Current assets of discontinued operations	75	75
Total current assets	21,310	24,566
Property, plant and equipment (net)	151	198
Total assets	21,461	24,764
Current liabilities:
Accounts payable	1,582	1,940
Accrued and other current liabilities	3,739	3,738
Current liabilities of discontinued operations	75	75
Total current liabilities	5,396	5,753
Other liabilities	166	176
Total liabilities	$ 5,562	$ 5,929
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2015 and March 31, 2016; 335,273 shares issued and outstanding at December 31, 2015 and March 31, 2016. Aggregate preference in liquidation of $4,006,511 at December 31, 2015 and March 31, 2016.
Common stock, $0.001 par value; 100,000,000 shares authorized at December 31, 2015 and March 31, 2016; 35,582,492 shares issued and outstanding at December 31, 2015 and March 31, 2016.	$ 35	$ 35
Additional paid-in capital	342,815	342,555
Accumulated other comprehensive loss	(662)	(596)
Accumulated deficit	(326,289)	(323,159)
Total stockholders' equity	15,899	18,835
Total liabilities and stockholders' equity	$ 21,461	$ 24,764

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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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).