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Organization and Significant Accounting Policies - Intangible Assets (Details) - Patents - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets useful life 10 years  
Finite-lived intangible assets, accumulated amortization $ 218 $ 127
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 94  
2019 94  
2020 94  
2021 94  
2022 94  
Thereafter $ 211