Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

v3.19.3.a.u2
Summary of Significant Accounting Policies - Narrative (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
financial_institution
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Concentration Risk [Line Items]      
Depreciation expense $ 8,500,000 $ 2,600,000 $ 400,000
Unrecognized tax benefits 0 0  
Accumulated depreciation, royalty interests 260,000 $ 0  
Operating lease right-of-use assets 3,098,000    
Total operating lease liabilities 3,367,000    
Operating lease cost 700,000    
Service life      
Concentration Risk [Line Items]      
Depreciation expense $ 2,400,000    
Cash and Cash Equivalents | Customer Concentration Risk      
Concentration Risk [Line Items]      
Number of customers | financial_institution 4    
Sales Revenue, Net | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration risk (in percentage) 36.50% 31.30% 26.50%
Maximum      
Concentration Risk [Line Items]      
Royalty payment arrangement, term 2 months    
Lease terms of payment arrangements 10 years    
Maximum | Water service-related assets      
Concentration Risk [Line Items]      
Finite-lived intangible asset, useful life 30 years    
Minimum      
Concentration Risk [Line Items]      
Royalty payment arrangement, term 1 month    
Lease terms of payment arrangements 1 month    
Minimum | Water service-related assets      
Concentration Risk [Line Items]      
Finite-lived intangible asset, useful life 3 years