Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 22,617	$ 17,031
Accounts receivable	1,674	1,391
Inventories	2,885	3,487
Prepaid expenses and other current assets	884	731
Total current assets	28,060	22,640
Property, plant and equipment, net	77,773	76,777
Restricted deposits	2,611	2,611
Deposits and other assets	803	803
Total assets	109,247	102,831
Current liabilities:
Accounts payable and accrued liabilities	4,703	7,476
Current portion of secured debt, net	324	330
Current portion 2017 Notes recorded at fair value	23,340
Derivative warrant liability	6,150	10,493
Total current liabilities	34,517	18,299
Long-term portion of secured debt, net		153
Long term portion 2017 Notes recorded at fair value		21,565
2022 Notes, net	16,545	14,341
Other long-term liabilities		147
Total liabilities	51,062	54,505
Commitments and Contingencies (see Note 11)
Stockholders' Equity
Common stock, $0.01 par value per share; 250,000,000 authorized; 89,234,771 and 21,607,048 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively	892	216
Additional paid-in capital	421,876	387,602
Deficit accumulated	(364,583)	(339,492)
Total stockholders' equity	58,185	48,326
Total liabilities and stockholders' equity	$ 109,247	$ 102,831