Summary of Significant Accounting Policies - Stock-Based Compensation (Details) |
12 Months Ended |
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Dec. 31, 2019
shares
| |
Restricted Stock Units to be Settled in Cash | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
Amount in cash received for each RSU is equal to the fair value of this number of Quanta common stock shares (in shares) | 1 |