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Summary of Significant Accounting Policies - Additional Information (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 USD ($) Customer Supplier | Sep. 30, 2019 USD ($) Customer Supplier | Sep. 30, 2020 USD ($) Customer Supplier Segment | Sep. 30, 2019 USD ($) Customer Supplier | Dec. 31, 2019 USD ($) Customer Supplier
Significant Accounting Policies [Line Items] |  |  |  |  |
Minimum tax benefit likely of being realized upon ultimate settlement with tax authority percentage |  |  | 50.00% |  |
QL Holdings LLC and Subsidiaries |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Allowance for doubtful accounts | $ 600,000 |  | $ 600,000 |  | $ 300,000
Revenue | 151,548,000 | $ 110,397,000 | 394,609,000 | $ 281,857,000 |
Accounts receivable | 63,084,000 |  | 63,084,000 |  | 56,012,000
Total purchases | 130,830,000 | 92,707,000 | 335,692,000 | 237,130,000 |
Accounts payable | 61,697,000 |  | $ 61,697,000 |  | 40,455,000
Number of operating segment | Segment |  |  | 1 |  |
QL Holdings LLC and Subsidiaries | Non-Current Assets |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred offering costs | 7,200,000 |  | $ 7,200,000 |  | 0
QL Holdings LLC and Subsidiaries | Customer Concentration Risk |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue | 46,000,000 | $ 23,700,000 | 102,400,000 | $ 61,300,000 |
Accounts receivable | $ 16,000,000 |  | $ 16,000,000 |  | $ 4,700,000
QL Holdings LLC and Subsidiaries | Customer Concentration Risk | Revenue from Contract with Customer Benchmark |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of major customer | Customer | 1 | 1 | 1 | 1 |
Concentration risk percentage | 30.00% | 21.00% | 26.00% | 22.00% |
QL Holdings LLC and Subsidiaries | Customer Concentration Risk | Accounts Receivable |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of major customer | Customer |  |  | 1 |  | 1
Concentration risk percentage |  |  | 25.00% |  | 8.00%
QL Holdings LLC and Subsidiaries | Supplier Concentration Risk | Purchases |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage | 25.00% | 22.00% | 20.00% | 23.00% |
Number of major supplier | Supplier | 2 | 2 | 2 | 2 |
Total purchases | $ 33,800,000 | $ 20,000,000 | $ 70,500,000 | $ 57,700,000 |
QL Holdings LLC and Subsidiaries | Supplier Concentration Risk | Accounts Payable Benchmark |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 23.00% |  | 36.00%
Number of major supplier | Supplier |  |  | 2 |  | 2
Accounts payable | $ 14,200,000 |  | $ 14,200,000 |  | $ 14,700,000

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