Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies - Additional Information (Details)

v3.19.3
Basis of Presentation and Significant Accounting Policies - Additional Information (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Customer
Sep. 30, 2018
USD ($)
Customer
Sep. 30, 2019
USD ($)
Customer
Sep. 30, 2018
Customer
Dec. 31, 2018
USD ($)
Customer
Jan. 01, 2019
USD ($)
Basis Of Presentation And Significant Accounting Policies [Line Items]            
Operating lease right-of-use assets $ 5,929,000   $ 5,929,000      
Operating lease liabilities 7,542,000   7,542,000      
Dividends declared $ 0 $ 0 $ 0      
Customer Concentration Risk [Member] | Trade Receivables [Member]            
Basis Of Presentation And Significant Accounting Policies [Line Items]            
Number of major partners | Customer     1   2  
Customer Concentration Risk [Member] | Trade Receivables [Member] | Partner 1 [Member]            
Basis Of Presentation And Significant Accounting Policies [Line Items]            
Concentration risk, percentage (in hundredths)     99.00%   67.00%  
Customer Concentration Risk [Member] | Trade Receivables [Member] | Partner 2 [Member]            
Basis Of Presentation And Significant Accounting Policies [Line Items]            
Concentration risk, percentage (in hundredths)         28.00%  
Customer Concentration Risk [Member] | Revenues [Member]            
Basis Of Presentation And Significant Accounting Policies [Line Items]            
Number of major partners | Customer 2 3 2 3    
Customer Concentration Risk [Member] | Revenues [Member] | Partner 1 [Member]            
Basis Of Presentation And Significant Accounting Policies [Line Items]            
Concentration risk, percentage (in hundredths) 68.00% 56.00% 78.00% 50.00%    
Customer Concentration Risk [Member] | Revenues [Member] | Partner 2 [Member]            
Basis Of Presentation And Significant Accounting Policies [Line Items]            
Concentration risk, percentage (in hundredths) 28.00% 28.00% 14.00% 21.00%    
Customer Concentration Risk [Member] | Revenues [Member] | Partner 3 [Member]            
Basis Of Presentation And Significant Accounting Policies [Line Items]            
Concentration risk, percentage (in hundredths)   14.00%   17.00%    
ASC 842 [Member]            
Basis Of Presentation And Significant Accounting Policies [Line Items]            
Operating lease right-of-use assets           $ 7,400,000
Operating lease liabilities           $ 9,200,000
ASC 842 [Member] | Lease-related Costs [Member]            
Basis Of Presentation And Significant Accounting Policies [Line Items]            
Lease-related restructuring liabilities, carrying amount         $ 1,700,000