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Energy Assets - Narrative (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) project | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) project | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |
Depreciation and amortization expense | $ 9,299 | $ 8,407 |  |
Finance lease right-of-use assets, amortization expense | 532 | 532 |  |
Interest costs capitalized | $ 862 | 788 |  |
Number of ESPC projects included in energy assets that the Company owns and operates | project | 3 |  | 3 |
Contract with customer, liability | $ 30,670 | 31,483 | $ 32,178 | $ 30,706
Contract with customer, current liability | 25,350 |  | 26,618 |
Asset retirement obligation recorded in project assets | 1,431 |  |  |
Asset retirement obligation liability recorded in accrued expenses | 1,559 |  |  |
Depreciation of property and equipment | 833 | 619 |  |
ARO accretion expense | 21 | 9 |  |
ARO Asset |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Depreciation of property and equipment | 19 | $ 11 |  |
Solar Projects 2020 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration, liability | $ 6,693 |  |  |
Number of projects under definitive agreement to acquire | project | 10 |  |  |
Solar Projects 2020, Additional Projects |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value of consideration | $ 13,902 |  |  |
Amount paid to developers of projects | 366 |  |  |
Energy Assets |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contract with customer, liability | 11,105 |  | 10,243 |
Energy Assets | Accrued Expenses And Other Current Liabilities |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contract with customer, current liability | $ 217 |  | $ 827 |

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