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Summary of Significant Accounting Policies - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Summary of Intangible Assets |  |
Intangible assets, Cost | $ 898 |
Finite lived intangible assets, Accumulated Amortization | 440 |
Intangible assets, Net Value | 458 | $ 527
License |  |
Summary of Intangible Assets |  |
Indefinite lived intangible assets, Net Value | $ 218 |
Intellectual property |  |
Summary of Intangible Assets |  |
Finite lived intangible assets, Useful Lives | 3 years |
Finite lived intangible assets, Cost | $ 322 |
Finite lived intangible assets, Accumulated Amortization | $ 322 |
License |  |
Summary of Intangible Assets |  |
Finite lived intangible assets, Useful Lives | 5 years |
Finite lived intangible assets, Cost | $ 358 |
Finite lived intangible assets, Accumulated Amortization | 118 |
Finite lived intangible assets, Net Value | $ 240 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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