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WARRANTS - Narrative (Details) |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 04, 2021 shares | Jul. 31, 2018 $ / shares shares | Jun. 30, 2021 USD ($) shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($)
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of securities called by warrants or rights (in shares) |  |  |  | 30,684 | 1,181,640 |
Conversion ratio | 1 |  |  |  |  |
Class of warrant or right, outstanding |  |  |  | 0 | 1,104,560 |
Conversion of stock, shares converted (in shares) |  |  |  | 1,104,560 | 0 |
Warrants vested during period | $ |  |  |  | $ 1,500,000 | $ 200,000 | $ 200,000
Marketing expense | $ |  |  |  | 57,338,000 | 55,271,000 | 44,362,000
Prepaid expenses and other current assets | $ |  |  |  | $ 37,938,000 | $ 27,112,000 |
Exercises during the period (in shares) |  |  |  | 1,150,956 | 0 |
Preferred stock, shares issued (in shares) |  |  |  | 0 | 0 |
Proceeds from the exercise of common stock warrants | $ |  |  |  | $ 395,000 | $ 0 | 0
VLL Agreement |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of securities called by warrants or rights (in shares) |  |  |  | 1,104,560 |  |
Exercise price of warrants or rights (in dollars per share) | $ / shares |  |  |  | $ 0.10 |  |
Fair value of warrants or rights | $ |  |  |  | $ 800,000 |  |
West Investments V, LLC |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Exercises during the period (in shares) |  |  | 245,468 |  |  |
Preferred stock, shares issued (in shares) |  |  | 25,000 |  |  |
Proceeds from the exercise of common stock warrants | $ |  |  | $ 3,500,000 |  |  |
Amount received in excess of anticipated shortfall | $ |  |  | $ 2,000,000 |  |  |
Affiliated Entity | West Investments V, LLC |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Expenses from transactions with related party | $ |  |  |  | 0 | 1,000,000 | 1,000,000
Marketing expense | $ |  |  |  | 500,000 | 1,500,000 | $ 800,000
Prepaid expenses and other current assets | $ |  |  |  | $ 0 | $ 1,400,000 |
July 2018 - Allotment 1 |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Exercise price of warrants or rights (in dollars per share) | $ / shares |  | $ 1.28 |  | $ 1.28 |  |
Warrants issued (in shares) |  | 122,735 |  | 122,735 |  |
Percent of warrants to vest immediately upon issuance |  | 50.00% |  |  |  |
Vesting period for warrants or rights |  | 24 months |  |  |  |
July 2018 - Allotment 2 |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Exercise price of warrants or rights (in dollars per share) | $ / shares |  | $ 1.28 |  | $ 1.28 |  |
Warrants issued (in shares) |  | 184,100 |  | 184,100 |  |
Vesting period for warrants or rights |  | 36 months |  |  |  |
Class B Common Stock |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Stock issued from conversion of preferred stock (in shares) | 1,104,560 |  |  |  |  |

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