Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating activities:
Net income (loss)	$ 18,213	$ 5,518	$ (5,350)
Net (income) loss from discontinued operations	56	112	(8,816)
Net income (loss) from continuing operations	18,269	5,630	(14,166)
Adjustments to reconcile net income (loss) from continuing operations to net cash used in operating activities of continuing operations:
Depreciation and amortization	2,195	1,348	1,747
Reserve for uncollectible accounts receivable	0	0	(111)
Share-based compensation	1,068	1,347	1,091
(Gain) loss on extinguishment of debt upon repurchase of convertible notes	0	(15,349)	3,384
(Amortization) accretion of debt net premium/discount from convertible notes	81	(140)	825
Gain on debt extinguishment upon conversion of convertible notes	0	0	(598)
Loss on net change in fair value of derivative assets and liabilities	548	869	145
Gain on sale of oilseed processing business	(31,278)	0	0
Non-cash restructuring charges	20	532	0
Non-cash income tax benefit	226	(368)	(9,748)
Changes in operating assets and liabilities:
Accounts receivable	794	(4,663)	(39)
Inventories	1,012	(1,007)	(2,730)
Other assets	110	1,165	2,894
Accounts payable and accrued liabilities	(357)	(2,929)	8,020
Deferred revenue	(2,471)	3,175	309
Net cash used in operating activities of continuing operations	(10,009)	(10,390)	(8,977)
Investing activities:
Purchases of property and equipment, net	(10,046)	(5,396)	(1,554)
Restricted cash	5,700	(3,200)	5,400
Net cash provided by (used in) investing activities of continuing operations	26,837	(8,596)	99,872
Financing activities:
Principal payments on debt obligations	(34,851)	(38,645)	(20,568)
Lease financing obligation payments	(127)	0	0
Proceeds from sale of common stock and warrants	501	2	15
Proceeds from issuance of debt, net of issuance costs	24,063	(355)	0
Net cash used in financing activities of continuing operations	(10,414)	(38,998)	(20,553)
Cash used in discontinued operations:
Net cash used in operating activities of discontinued operations	(298)	(1,186)	(32,490)
Net cash used in investing activities of discontinued operations	0	0	(3,375)
Net cash provided by financing activities of discontinued operations	0	0	28,608
Net cash used in discontinued operations	(298)	(1,186)	(7,257)
Net increase (decrease) in cash and cash equivalents	6,116	(59,170)	63,085
Cash and cash equivalents at beginning of year	28,759	87,929	24,844
Cash and cash equivalents at end of year	34,875	28,759	87,929
Supplemental disclosure of cash flow information:
Interest paid	1,986	3,386	4,090
Supplemental disclosure of non-cash activities:
Conversions of convertible senior notes to common stock	0	0	2,200
Property acquired under lease financing obligation	14,756	7,391	0
Oilseed processing
Investing activities:
Proceeds from sale of business	31,183	0	0
LC
Investing activities:
Proceeds from sale of business	$ 0	$ 0	$ 96,026