Annual report pursuant to Section 13 and 15(d)

Concentration of Risk, Segment and Geographic Information - Additional Information 1 (Details)

v3.10.0.1
Concentration of Risk, Segment and Geographic Information - Additional Information 1 (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Customer
Dec. 31, 2017
USD ($)
Customer
Concentration Risk [Line Items]    
Cash equivalents | $ $ 45,780,000 $ 43,471,000
Customer Concentration Risk [Member] | Revenues [Member]    
Concentration Risk [Line Items]    
Number of major partners | Customer 3 1
Customer Concentration Risk [Member] | Revenues [Member] | Partner 1 [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 34.00% 95.00%
Customer Concentration Risk [Member] | Revenues [Member] | Partner 2 [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 25.00%  
Customer Concentration Risk [Member] | Revenues [Member] | Partner 3 [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 14.00%  
Customer Concentration Risk [Member] | Accounts Receivable [Member]    
Concentration Risk [Line Items]    
Number of major partners | Customer 2 1
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Partner 1 [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 67.00% 100.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Partner 2 [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 28.00%  
Customer Concentration Risk [Member] | Money Market Funds [Member]    
Concentration Risk [Line Items]    
Cash equivalents | $ $ 0