CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 20,440	$ 24,189
Prepaid expenses and other current assets	4,051	4,640
Current assets of discontinued operations	75	171
Total current assets	24,566	29,000
Property, plant and equipment (net)	$ 198	$ 387
Long-term assets of discontinued operations
Total assets	$ 24,764	$ 29,387
Current liabilities:
Accounts payable	1,940	2,792
Accrued and other current liabilities	$ 3,738	$ 4,626
Other liabilities measured at fair value
Current liabilities of discontinued operations	$ 75	$ 75
Total current liabilities	5,753	7,493
Other liabilities	176	206
Total liabilities	$ 5,929	$ 7,699
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2014 and 2015; 335,273 shares issued and outstanding at December 31, 2014 and 2015. Aggregate preference in liquidation of $3,989,749 at December 31, 2014 and 2015
Common stock, $0.001 par value; 100,000,000 shares authorized at December 31, 2014 and 2015; 23,199,469 and 35,582,492 shares issued and outstanding at December 31, 2014 and 2015, respectively	$ 35	$ 23
Additional paid-in capital	342,555	330,962
Accumulated other comprehensive income (loss)	(596)	(480)
Accumulated deficit	(323,159)	(308,817)
Total stockholders' equity	18,835	21,688
Total liabilities and stockholders' equity	$ 24,764	$ 29,387

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).