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Related party transactions (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |
Accounts payable outstanding | $ 278,739 |  | $ 278,739 |  | $ 200,558
PERC Water Corporation |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Purchases of services | 129,000 | $ 371,000 | 285,000 | $ 865,000 |
Accounts payable outstanding | 279,000,000 | $ 201,000,000 | 279,000,000 | $ 201,000,000 |
Amount of expense related to sublease agreement | $ 24,000 |  | $ 29,000 |  |

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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