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Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

v3.20.4
Summary of Significant Accounting Policies - Narrative (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
financialInstitution
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Concentration Risk [Line Items] Ìý Ìý Ìý
Depreciation expense $ 13,800,000 $ 8,500,000 $ 2,600,000
Valuation allowance Ìý 0 Ìý
Impairments 0 0 0
Depletion expense 400,000 300,000 0
Unrecognized tax benefits 0 0 Ìý
Land sales expenses $ 3,973,000 225,000 $ 19,000
Revision of prior period, reclassification, adjustment Ìý Ìý Ìý
Concentration Risk [Line Items] Ìý Ìý Ìý
Land sales expenses Ìý 200,000 Ìý
Service life Ìý Ìý Ìý
Concentration Risk [Line Items] Ìý Ìý Ìý
Depreciation expense Ìý $ 2,400,000 Ìý
Cash and cash equivalents | Customer concentration risk Ìý Ìý Ìý
Concentration Risk [Line Items] Ìý Ìý Ìý
Number of customers | financialInstitution 3 Ìý Ìý
Sales revenue, net | Customer concentration risk Ìý Ìý Ìý
Concentration Risk [Line Items] Ìý Ìý Ìý
Concentration risk (in percentage) 28.30% 36.50% 31.30%
Maximum Ìý Ìý Ìý
Concentration Risk [Line Items] Ìý Ìý Ìý
Royalty payment arrangement, term 2 months Ìý Ìý
Lease terms of payment arrangements 10 years Ìý Ìý
Valuation allowance $ 100,000 Ìý Ìý
Maximum | Revision of prior period, reclassification, adjustment Ìý Ìý Ìý
Concentration Risk [Line Items] Ìý Ìý Ìý
Land sales expenses Ìý Ìý $ 100,000
Maximum | Water service-related assets Ìý Ìý Ìý
Concentration Risk [Line Items] Ìý Ìý Ìý
Finite-lived intangible asset, useful life 30 years Ìý Ìý
Minimum Ìý Ìý Ìý
Concentration Risk [Line Items] Ìý Ìý Ìý
Royalty payment arrangement, term 1 month Ìý Ìý
Minimum | Water service-related assets Ìý Ìý Ìý
Concentration Risk [Line Items] Ìý Ìý Ìý
Finite-lived intangible asset, useful life 3 years Ìý Ìý