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Warrants - Narrative (Details)
$ in Thousands
3 Months Ended
Jan. 26, 2018
USD ($)
Aug. 30, 2016
director
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
director
Dec. 31, 2017
USD ($)
Warrants          
Number of directors to whom the Company agreed to issue warrants | director       2  
Reclassification of fair value of warrant liability to shareholders' equity $ 5,203     $ 5,203  
Fair value of warrant liability         $ 4,021
Expense related to warrant liability     $ 0 $ 1,182  
Payable related to settlement of exercised warrants     $ 1,968    
Credit Agreement | Wells Fargo Term Loan          
Warrants          
Credit agreement term   1 year      
Directors          
Warrants          
Number of directors to whom the Company agreed to issue warrants | director   2