Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 8,422	$ 24,625
Accounts receivable	1,664	1,358
Inventories	3,723	3,581
Prepaid expenses and other current assets	1,128	1,163
Total current assets	14,937	30,727
Property, plant and equipment, net	83,242	83,475
Debt issue costs, net	741	801
Deposits and other assets	1,335	1,352
Total assets	100,255	116,355
Current liabilities:
Accounts payable and accrued liabilities	9,859	13,030
Current portion of secured debt, net of $487 and $492 discount at March 31, 2014 and December 31, 2013, respectively	1,288	788
Derivative warrant liability	5,965	7,243
Total current liabilities	17,112	21,061
Long-term portion of secured debt, net of $309 and $450 discount at March 31, 2014 and December 31, 2013, respectively	8,735	9,339
Convertible notes, net	13,808	14,501
Other long-term liabilities	468	479
Total liabilities	40,123	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 March 31, 2014 and December 31, 2013
Common stock, $0.01 par value per share; 150,000,000 authorized; 68,858,219 and 68,492,894 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively	689	685
Additional paid-in capital	333,568	332,443
Deficit accumulated during development stage	(274,125)	(262,153)
Total stockholders' equity	60,132	70,975
Total liabilities and stockholders' equity	$ 100,255	$ 116,355