Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 5,908	$ 24,625
Accounts receivable	3,085	1,358
Inventories	4,243	3,581
Prepaid expenses and other current assets	935	1,163
Total current assets	14,171	30,727
Property, plant and equipment, net	83,704	83,475
Debt issue costs, net	603	801
Restricted deposits	2,611
Deposits and other assets	883	1,352
Total assets	101,972	116,355
Current liabilities:
Accounts payable and accrued liabilities	8,195	13,030
Current portion of secured debt, net of $36 and $492 discount at June 30, 2014 and December 31, 2013, respectively	268	788
Derivative warrant liability	4,687	7,243
Total current liabilities	13,150	21,061
Long-term portion of secured debt, net of $32 and $450 discount at June 30, 2014 and December 31, 2013, respectively	31,871	9,339
2022 notes, net (see note 7)	12,956	14,501
Other long-term liabilities	359	479
Total liabilities	58,336	45,380
Commitments and Contingencies
Stockholders' Equity
Preferred stock, $0.01 par value per share; 10,000,000 shares authorized; none issued and outstanding at June 30, 2014 and December 31, 2013
Common stock, $0.01 par value per share; 150,000,000 authorized; 69,104,005 and 68,492,894 shares issued and outstanding at June 30, 2014 and December 31, 2013, respectively	691	685
Additional paid-in capital	334,226	332,443
Deficit accumulated during development stage	(291,281)	(262,153)
Total stockholders' equity	43,636	70,975
Total liabilities and stockholders' equity	$ 101,972	$ 116,355