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ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  |  |  | 6 Months Ended |  |
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May 24, 2021 | Apr. 19, 2021 | Mar. 19, 2021 | Mar. 15, 2021 | Mar. 12, 2021 | Feb. 22, 2021 | Feb. 15, 2021 | Feb. 01, 2021 | Jan. 25, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 16, 2020 | Feb. 26, 2020
Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  |  |  | $ 2,135 | $ 3,530 |  |
Indoor Garden & Lighting, Inc |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for purchase |  |  |  |  |  |  |  |  | $ 1,700 |  |  |  |
Cash consideration for purchase |  |  |  |  |  |  |  |  | 1,200 |  |  |  |
Equity consideration for purchase |  |  |  |  |  |  |  |  | 500 |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  |  | $ 800 |  |  |  |
Grow Depot Maine |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for purchase |  |  |  |  |  |  |  | $ 2,100 |  |  |  |  |
Cash consideration for purchase |  |  |  |  |  |  |  | 1,700 |  |  |  |  |
Equity consideration for purchase |  |  |  |  |  |  |  | 400 |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  | $ 1,300 |  |  |  |  |
Grow Warehouse LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for purchase |  |  |  |  |  |  | $ 17,800 |  |  |  |  |  |
Cash consideration for purchase |  |  |  |  |  |  | 8,100 |  |  |  |  |  |
Equity consideration for purchase |  |  |  |  |  |  | 9,700 |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  | $ 11,100 |  |  |  |  |  |
San Diego Hydroponics & Organics |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for purchase |  |  |  |  |  | $ 9,300 |  |  |  |  |  |  |
Cash consideration for purchase |  |  |  |  |  | 4,800 |  |  |  |  |  |  |
Equity consideration for purchase |  |  |  |  |  | 4,500 |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  | $ 5,700 |  |  |  |  |  |  |
Charcoir Corporation |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for purchase |  |  |  |  | $ 16,400 |  |  |  |  |  |  |  |
Cash consideration for purchase |  |  |  |  | 9,900 |  |  |  |  |  |  |  |
Equity consideration for purchase |  |  |  |  | 6,500 |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  | $ 6,100 |  |  |  |  |  |  |  |
55 Hydroponics |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for purchase |  |  |  | $ 6,500 |  |  |  |  |  |  |  |  |
Cash consideration for purchase |  |  |  | 5,400 |  |  |  |  |  |  |  |  |
Equity consideration for purchase |  |  |  | 1,100 |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  | 3,900 |  |  |  |  |  |  |  |  |
Aquarius |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for purchase |  |  |  | 3,600 |  |  |  |  |  |  |  |  |
Cash consideration for purchase |  |  |  | 2,400 |  |  |  |  |  |  |  |  |
Equity consideration for purchase |  |  |  | 1,200 |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  | $ 1,700 |  |  |  |  |  |  |  |  |
Agron, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for purchase |  |  | $ 11,300 |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase |  |  | 6,000 |  |  |  |  |  |  |  |  |  |
Equity consideration for purchase |  |  | 5,300 |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  | $ 8,700 |  |  |  |  |  |  |  |  |  |
Health & Harvest LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100
Transaction cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,850
Down River Hydro |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for purchase |  | $ 4,400 |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase |  | 3,200 |  |  |  |  |  |  |  |  |  |  |
Equity consideration for purchase |  | 1,200 |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  | $ 2,100 |  |  |  |  |  |  |  |  |  |  |
Harvest |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for purchase | $ 8,300 |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase | 5,600 |  |  |  |  |  |  |  |  |  |  |  |
Equity consideration for purchase | 2,800 |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill | $ 4,600 |  |  |  |  |  |  |  |  |  |  |  |
H2O Hydroponics LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |
Transaction cost |  |  |  |  |  |  |  |  |  |  |  | $ 2,000 |

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