Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Narrative (Details)

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Fair Value Measurement - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Fair Value, Recurring | Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Changes in fair value of liability   $ 0   $ 0  
Warrants to purchase common stock          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Changes in fair value of liability     $ (675,000)   $ 0
Warrants to purchase common stock | Fair Value, Recurring | Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Changes in fair value of liability $ (300,000)   (700,000)    
Value Creation Incentive Plan and Option-Based Incentive Plan, Cash Portion          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total value of incentive plans $ 200,000   $ 200,000