CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 1,839	$ 2,934
Short-term investments	172	330
Prepaid expenses and other assets	300	354
Assets held for sale	4,601	5,068
Total current assets	6,912	8,686
Property, plant and equipment, net	3,246	3,389
Other long term assets	976	569
Total assets	11,134	12,644
Current liabilities
Accounts payable and other accrued liabilities	779	943
Other current liabilities	1,687	12
Liabilities related to assets held for sale	3,870	4,019
Total current liabilities	6,336	4,974
Other long term liabilities	418	33
Total liabilities	6,754	5,007
Commitments and contingencies
Equity
Common stock, $.01 par value, 200,000,000 shares authorized; 98,080,433 and 95,620,796 shares issued and outstanding respectively	980	955
Additional paid in capital	519,333	517,806
Accumulated deficit	(515,933)	(511,124)
Shareholders' equity	4,380	7,637
Total liabilities and equity	$ 11,134	$ 12,644

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.