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Fair Value Measurements - Summary of the changes in the fair value of the FPA liability (Details) - Fair Value, Inputs, Level 3 [Member] - Empower Ltd [Member] - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2021
Fair Value Liabilities Measured On Recurring Basis [Line Items]      
Beginning balance $ 2,050,000 $ 50,000 $ 2,050,000
Recognized loss on change in fair value (1) (300,000) 2,000,000 1,500,000
Ending balance $ 1,750,000 $ 2,050,000 $ 3,250,000