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Income Taxes - Summary of Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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NOL Carryforwards |  |
Deferred Tax Asset, Nontaxable Entities, Gross Amount | $ 20,248 | $ 7,220
Valuation Allowance, Nontaxable Entities | (20,248) | (7,220)
Total Valuation Allowance | (34,889) | (21,861)
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 | 137,949 | 215,898
Valuation Allowance, NOL Carryforwards | $ 0 | $ 0

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- Definition Amount of deferred tax assets 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 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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