Related Parties (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Jun. 21, 2018
USD ($)
May 31, 2017
USD ($)
Apr. 30, 2017
USD ($)
item
Jan. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Related Parties              
Cash payments         $ 500    
Accounts Receivable         $ 100    
Amount due to related party             $ 0
Amount due from related party             0
Option to extend         false    
Sublease income         $ 908    
Maturity term from issuance date of the notes   7 years 7 years        
Maturity date of termination   60 days 60 days        
Interest rate (as a percent)     2.05%        
January 2017 promissory note              
Related Parties              
Amount due to related party             0
Amount due from related party             0
Interest rate (as a percent)       1.97%      
May 2017 promissory note              
Related Parties              
Amount due to related party             0
Amount due from related party             0
Interest rate (as a percent)   2.04%          
Flagship | Services Agreement              
Related Parties              
Payment of general and administrative expenses           $ 1,300 900
Cash payments           1,300 $ 900
Amount due to related party         $ 0 $ 0  
Board of Directors Chairman              
Related Parties              
Amount loaned or remitted to related parties   $ 1,800   $ 700      
Principal amount of promissory note forgiven $ 2,500            
Interest on promissory note forgiven 100            
Executive officer              
Related Parties              
Amount due from related party 200            
Amount loaned or remitted to related parties     $ 200        
Number of promissory notes | item     2        
Number of restricted stock agreements | item     2        
Interest income form related parties $ 100