CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 13,591	$ 16,520
Prepaid expenses and other current assets	2,460	3,097
Total current assets	16,051	19,617
Property, plant and equipment (net)	32	45
Total assets	16,083	19,662
Current liabilities:
Accounts payable	2,038	2,497
Accrued and other current liabilities	2,281	2,762
Total current liabilities	4,319	5,259
Other liabilities	128	130
Total liabilities	4,447	5,389
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2016 and June 30, 2017; 335,273 shares issued and outstanding at December 31, 2016 and June 30, 2017. Aggregate preference in liquidation of $4,006,512 at December 31, 2016 and June 30, 2017.
Common stock, $0.001 par value; 100,000,000 shares authorized at December 31, 2016 and June 30, 2017; 4,256,829 and 4,439,947 shares issued and outstanding at December 31, 2016 and June 30, 2017 respectively.	4	4
Additional paid-in capital	351,148	350,051
Accumulated other comprehensive loss	(736)	(743)
Accumulated deficit	(338,780)	(335,039)
Total stockholders' equity	11,636	14,273
Total liabilities and stockholders' equity	$ 16,083	$ 19,662

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).