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Convertible Preferred Stock - Related Party Transaction (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended
Jun. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Class of Stock [Line Items]      
Shares redeemed and retired (in shares)   1,202,196  
Difference between the purchase price and the carrying value   $ 425  
Share price (in dollars per share)   $ 1.49  
Series B Preferred Stock      
Class of Stock [Line Items]      
Share price (in dollars per share) $ 1.73   $ 1.73
Series B Preferred Stock | Former employee      
Class of Stock [Line Items]      
Shares redeemed and retired (in shares) 1,202,196    
Purchase price $ 2,500    
Difference between the purchase price and the carrying value $ 425    
Purchase price (in dollars per share) $ 2.04