Selected Quarterly Data (Unaudited) (Details 3 ) (USD $) In Thousands, unless otherwise specified	3 Months Ended								6 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating activities:
Net income (loss)	$ (3,622)	$ (5,213)	$ (2,253)	$ 29,301	$ (2,896)	$ 6,069	$ (1,468)	$ 3,813	$ 27,048	$ 21,835	$ 8,414	$ 18,213	$ 5,518	$ 19,933
Net (income) loss from discontinued operations		23	11	15	149	24			26	49	(37)	56	112	(8,816)
Net income (loss) from continuing operations		(5,190)	(2,242)	29,316	(2,747)	6,093			27,074	21,884	8,377	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				328					693	1,420	1,017	2,195	1,348	1,747
Share-based compensation				241					442	746	1,058	1,068	1,347	1,091
(Amortization) accretion of debt net premium/discount from convertible notes				73					73	73	(140)	81	(140)	825
Loss on extinguishment of debt											(15,349)	0	(15,349)	3,384
Loss on net change in fair value of derivative assets and liabilities		0	(139)	706	(136)	(290)			567	567	1,005	548	869	145
Gain on sale of oilseed processing business		0	0	(31,278,000)					(31,278)	(31,278)		(31,278)	0	0
Non-cash restructuring charges				2					16	17	377	20	532	0
Changes in operating assets and liabilities:
Accounts receivable				2,306					1,354	4,121	(1,273)	794	(4,663)	(39)
Inventories				(623)					840	1,306	(632)	1,012	(1,007)	(2,730)
Other assets				189					203	35	278	110	1,165	2,894
Accounts payable and accrued liabilities				(2,153)					(3,944)	(5,184)	(6,972)	(357)	(2,929)	8,020
Deferred revenue				(1,815)					(2,291)	(2,545)	2,986	(2,471)	3,175	309
Net cash used in operating activities of continuing operations				(2,708)					(6,251)	(8,838)	(9,268)	(10,009)	(10,390)	(8,977)
Investing activities:
Proceeds from sale of oilseed processing business, net of transaction costs paid				33,733					31,183	31,183
Purchases of property and equipment, net				(3,636)					(7,228)	(9,439)	(3,232)	(10,046)	(5,396)	(1,554)
Restricted cash				2,500					2,500	4,100		5,700	(3,200)	5,400
Net cash provided by (used in) investing activities of continuing operations				32,597					26,455	25,844	(3,232)	26,837	(8,596)	99,872
Financing activities:
Repurchase of convertible debt											(38,645)
Principal payments on debt obligations				0					(34,851)	(34,851)		(34,851)	(38,645)	(20,568)
Lease financing obligation payments				0					(19)	(72)
Proceeds from sale of common stock and warrants				6					447	481		501	2	15
Proceeds from issuance of debt, net of issuance costs				0					0	2,889
Net cash used in financing activities of continuing operations				6					(34,423)	(31,553)	(38,645)	(10,414)	(38,998)	(20,553)
Cash used in discontinued operations:
Net cash used in operating activities of discontinued operations				(95)					(183)	(274)	(1,112)	(298)	(1,186)	(32,490)
Net cash used in discontinued operations				(95)					(183)	(274)	(1,112)	(298)	(1,186)	(7,257)
Net increase (decrease) in cash and cash equivalents				29,800					(14,402)	(14,821)	(52,257)	6,116	(59,170)	63,085
Cash and cash equivalents at beginning of year	13,938	14,357	58,559	28,759	35,672	44,620		87,929	28,759	28,759	87,929	28,759	87,929	24,844
Cash and cash equivalents at end of year	34,875	13,938	14,357	58,559	28,759	35,672	44,620		14,357	13,938	35,672	34,875	28,759	87,929
Supplemental disclosure of cash flow information:
Interest paid				0					1,038	1,513	2,428	1,986	3,386	4,090
Supplemental disclosure of non-cash activities:
Property acquired under lease financing obligation				3,927					12,551	14,293	5,377	14,756	7,391	0
Previously Reported [Member]
Operating activities:
Net income (loss)		(5,257)	(2,479)	30,122	(3,016)	5,798			27,643	22,386	8,143		5,127
Net (income) loss from discontinued operations		23	11	15	149	24			26	49	(37)		112
Net income (loss) from continuing operations		(5,234)	(2,468)	30,137	(2,867)	5,822			27,669	22,435	8,106		5,239
Adjustments to reconcile net income (loss) from continuing operations to net cash used in operating activities of continuing operations:
Depreciation and amortization				328					618	1,120	1,017		1,348
Share-based compensation				241					442	746	1,058		1,347
(Amortization) accretion of debt net premium/discount from convertible notes				73					73	73	(140)		(140)
Loss on extinguishment of debt											(15,349)		(15,349)
Loss on net change in fair value of derivative assets and liabilities		0	(232)	324	(41)	(290)			92	92	1,005		964
Gain on sale of oilseed processing business		0	203	(31,481)					(31,278)	(31,278)
Non-cash restructuring charges				2					16	17	377		532
Changes in operating assets and liabilities:
Accounts receivable				2,306					1,354	4,121	(1,273)		(4,663)
Inventories				(623)					840	1,306	(632)		(1,007)
Other assets				(578)					(447)	(548)	278		785
Accounts payable and accrued liabilities				(2,244)					(4,248)	(6,204)	(6,017)		(1,464)
Deferred revenue				(1,815)					(2,291)	(2,545)	2,986		3,175
Net cash used in operating activities of continuing operations				(3,330)					(7,160)	(10,665)	(8,584)		(9,601)
Investing activities:
Proceeds from sale of oilseed processing business, net of transaction costs paid				33,733					31,183	31,183
Purchases of property and equipment, net				(3,014)					(6,338)	(7,684)	(3,916)		(6,540)
Restricted cash				2,500					2,500	4,100			(3,200)
Net cash provided by (used in) investing activities of continuing operations				33,219					27,345	27,599	(3,916)		(9,740)
Financing activities:
Repurchase of convertible debt											(38,645)
Principal payments on debt obligations				0					(34,851)	(34,851)			(38,645)
Lease financing obligation payments				0					0	0
Proceeds from sale of common stock and warrants				6					447	481			2
Proceeds from issuance of debt, net of issuance costs				0					0	2,889
Net cash used in financing activities of continuing operations				6					(34,404)	(31,481)	(38,645)		(38,643)
Cash used in discontinued operations:
Net cash used in operating activities of discontinued operations				(95)					(183)	(274)	(1,112)		(1,186)
Net cash used in discontinued operations				(95)					(183)	(274)	(1,112)		(1,186)
Net increase (decrease) in cash and cash equivalents				29,800					(14,402)	(14,821)	(52,257)		(59,170)
Cash and cash equivalents at beginning of year		14,357	58,559	28,759	35,672	44,620		87,929	28,759	28,759	87,929	28,759	87,929
Cash and cash equivalents at end of year		13,938	14,357	58,559	28,759	35,672			14,357	13,938	35,672		28,759
Supplemental disclosure of cash flow information:
Interest paid				0					958	958	2,428		3,386
Supplemental disclosure of non-cash activities:
Property acquired under lease financing obligation				0					0	0	0
Adjustments [Member]
Operating activities:
Net income (loss)		44	226	(821)	120	271			(595)	(551)	271		391
Net (income) loss from discontinued operations		0	0	0	0	0			0	0	0		0
Net income (loss) from continuing operations		44	226	(821)	120	271			(595)	(551)	271		391
Adjustments to reconcile net income (loss) from continuing operations to net cash used in operating activities of continuing operations:
Depreciation and amortization				0					75	300	0		0
Share-based compensation				0					0	0	0		0
(Amortization) accretion of debt net premium/discount from convertible notes				0					0	0	0		0
Loss on extinguishment of debt											0		0
Loss on net change in fair value of derivative assets and liabilities		0	93	382	(95)	0			475	475	0		(95)
Gain on sale of oilseed processing business		0	(203)	203					0	0
Non-cash restructuring charges				0					0	0	0		0
Changes in operating assets and liabilities:
Accounts receivable				0					0	0	0		0
Inventories				0					0	0	0		0
Other assets				767					650	583	0		380
Accounts payable and accrued liabilities				91					304	1,020	(955)		(1,465)
Deferred revenue				0					0	0	0		0
Net cash used in operating activities of continuing operations				622					909	1,827	(684)		(789)
Investing activities:
Proceeds from sale of oilseed processing business, net of transaction costs paid				0					0	0
Purchases of property and equipment, net				(622)					(890)	(1,755)	684		1,144
Restricted cash				0					0	0			0
Net cash provided by (used in) investing activities of continuing operations				(622)					(890)	(1,755)	684		1,144
Financing activities:
Repurchase of convertible debt											0
Principal payments on debt obligations				0					0	0			0
Lease financing obligation payments				0					(19)	(72)
Proceeds from sale of common stock and warrants				0					0	0			0
Proceeds from issuance of debt, net of issuance costs				0					0	0
Net cash used in financing activities of continuing operations				0					(19)	(72)	0		(355)
Cash used in discontinued operations:
Net cash used in operating activities of discontinued operations				0					0	0	0		0
Net cash used in discontinued operations				0					0	0	0		0
Net increase (decrease) in cash and cash equivalents				0					0	0	0		0
Cash and cash equivalents at beginning of year		0	0	0	0	0		0	0	0	0	0	0
Cash and cash equivalents at end of year		0	0	0	0	0			0	0	0		0
Supplemental disclosure of cash flow information:
Interest paid				0					80	555	0		0
Supplemental disclosure of non-cash activities:
Property acquired under lease financing obligation				$ 3,927					$ 12,551	$ 14,293	$ 5,377