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Related Party Transactions - (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 15, 2017
USD ($)
shares
Sep. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
employee
shares
Sep. 30, 2017
employee
Sep. 30, 2018
USD ($)
Sep. 30, 2017
employee
Dec. 31, 2017
USD ($)
employee
shares
Related Party Transactions              
Rent expense | $   $ 0     $ 0    
Issuance of stock (in shares) | shares     3,592,858        
Private placement              
Related Party Transactions              
Issuance of stock (in shares) | shares 1,324,256            
Net proceeds | $ $ 11,300            
1 Officer              
Related Party Transactions              
Number of officers | employee     1        
Issuance of stock (in shares) | shares     14,286        
Net proceeds | $     $ 100        
Current Officer [Member]              
Related Party Transactions              
Number of officers | employee       1   1  
Former Officer [Member]              
Related Party Transactions              
Number of officers | employee       1   1  
Investors Related To Board Member And Officers              
Related Party Transactions              
Issuance of stock (in shares) | shares     71,429        
Net proceeds | $     $ 500        
Three Board Members              
Related Party Transactions              
Number Of Board Members In Related Party Transaction | employee             3
Three Board Members | Private placement              
Related Party Transactions              
Issuance of stock (in shares) | shares             56,678
Net proceeds | $             $ 500
1 investor related to 1 board member              
Related Party Transactions              
Number Of Board Members In Related Party Transaction | employee     1        
1 investor related to 1 board member | Private placement              
Related Party Transactions              
Issuance of stock (in shares) | shares             52,798
Net proceeds | $             $ 500