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General - Additional Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2019
extension
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
May 31, 2018
USD ($)
Debt Instrument [Line Items]                  
Cash and cash equivalents   $ 45,039   $ 45,039       $ 7,703  
Cash and cash equivalents   $ 45,039   $ 45,039       $ 7,703  
Discount rate   12.00%   12.00%          
Operating lease, payments   $ 100 $ 100 $ 400 $ 400        
Payments to be received   3,617   3,617   $ 3,600      
Term of contract 18 months                
Number of renewal terms | extension 3                
Renewal term 6 months                
Operating lease, liability   $ 2,873   $ 2,873          
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Cash and cash equivalent threshold                 $ 50,000
Accounting Standards Update 2016-02                  
Debt Instrument [Line Items]                  
Right-of-use asset             $ 2,200    
Operating lease, liability             2,900    
Deferred rent credit             $ 700