Income Taxes - Summary of Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
NOL Carryforwards
Deferred Tax Asset, Nontaxable Entities, Gross Amount	$ 7,220	$ 3,607
Valuation Allowance, Nontaxable Entities	(7,220)	(3,607)
Total Valuation Allowance	(21,861)	(18,248)
Cellulosic Biofuel Producer Credit
NOL Carryforwards
Gross Amount, Tax Credits	14,641	14,641
Valuation Allowance, Tax Credits	(14,641)	(14,641)
New Zealand JV \| New Zealand JV NOL Carryforwards
NOL Carryforwards
Gross Amount, NOL Carryforwards	215,898	232,846
Valuation Allowance, NOL Carryforwards	$ 0	$ 0

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- Definition

Valuation Allowance, Nontaxable Entities

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No definition available.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-Section 30
-Paragraph 5
-Subparagraph (e)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized.

+ References

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6528051

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