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Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Adoption of new accounting standard - ASC 606     $ 1,034
Accumulated deficit $ (38,090)   (33,615)
Deferred revenue, current 0   1,034
Revenues 36 $ 2,432  
Operating loss (5,284) (2,482)  
Net loss (5,509) $ (2,652)  
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Deferred revenue, current     1,034
Revenues (1,034)    
Operating loss 1,034    
Net loss 1,034    
Accumulated Deficit      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Adoption of new accounting standard - ASC 606     $ 1,034
Net loss $ (5,509)