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Summary of Operations and Significant Accounting Policies - Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in years) 16 years  
Initial Cost $ 2,438 $ 2,267
Net of Accumulated Amortization $ 696 1,941
Patents    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in years) 16 years  
Initial Cost $ 913 742
Net of Accumulated Amortization 696 581
Licensed technology    
Finite-Lived Intangible Assets [Line Items]    
Initial Cost 1,525 1,525
Net of Accumulated Amortization $ 0 $ 1,360