Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 20,393	$ 27,888
Accounts receivable	1,204	1,122
Inventories	4,178	3,458
Prepaid expenses and other current assets	860	850
Total current assets	26,635	33,318
Property, plant and equipment, net	74,538	75,592
Restricted deposits	2,611	2,611
Deposits and other assets	803	803
Total assets	104,587	112,324
Current liabilities:
Accounts payable and accrued liabilities	4,998	6,193
2017 Notes recorded at fair value	16,492	25,769
Derivative warrant liability	4,942	2,698
Total current liabilities	26,432	34,660
2022 Notes, net	1,088	8,221
Other long-term liabilities	167	179
Total liabilities	27,687	43,060
Commitments and Contingencies (see Note 11)
Stockholders' Equity
Common stock, $0.01 par value per share; 250,000,000 authorized; 15,065,551 and 7,074,246 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	151	71
Additional paid-in capital	459,403	445,913
Accumulated Deficit	(382,654)	(376,720)
Total stockholders' equity	76,900	69,264
Total liabilities and stockholders' equity	$ 104,587	$ 112,324