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Debt (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
May 23, 2017
Aug. 01, 2016
Loan and Security Agreement [Abstract]            
Payments for debt issuance costs     $ 990,000 $ 0    
Repayments of debt     20,000,000 $ 0    
Outstanding debt     $ 0      
Original Loan Agreement [Member]            
Loan and Security Agreement [Abstract]            
Payments for debt issuance costs   $ 90,000        
Additional interest rate charged on due date   1.50%        
Amended Loan Agreement [Member]            
Loan and Security Agreement [Abstract]            
Aggregate principal amount of borrowing capacity           $ 20,000,000
Payments for debt issuance costs $ 900,000          
Repayments of debt 20,000,000          
Payment for accrued and unpaid interest $ 100,000          
First Term Loan under Amended Loan Agreement [Member]            
Loan and Security Agreement [Abstract]            
Face amount           $ 15,000,000
Second Term Loan under Amended Loan Agreement [Member]            
Loan and Security Agreement [Abstract]            
Face amount         $ 5,000,000