Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 27,030	$ 11,553
Accounts receivable	1,443	1,054
Inventories	3,846	4,362
Prepaid expenses and other current assets	15,258	712
Total current assets	47,577	17,681
Property, plant and equipment, net	67,180	70,369
Deposits and other assets	1,273	803
Total assets	116,030	88,853
Current liabilities:
Accounts payable and accrued liabilities	3,520	4,011
2020 Notes embedded derivative liability	684	5,224
Derivative warrant liability	86	1,951
Total current liabilities	4,290	11,186
Other long-term liabilities	414	130
Total liabilities	16,435	25,322
Commitments and Contingencies (see Note 11)
Stockholders' Equity
Common Stock, $0.01 par value per share; 250,000,000 authorized, 7,990,050 and 1,090,553 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	80	11
Additional paid-in capital	514,859	464,870
Accumulated deficit	(415,344)	(401,350)
Total stockholders' equity	99,595	63,531
Total liabilities and stockholders' equity	116,030	88,853
Convertible 2020 Notes [Member]
Current liabilities:
2020 Notes, net	11,731	13,491
Convertible 2022 Notes [Member]
Current liabilities:
2020 Notes, net		$ 515