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Equity-Based Compensation - Summary of Weighted Average Assumptions Used to Compute Fair Value of Option Granted (Detail)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 1.00% 0.80% 2.10%
Expected life of options 6 years 6 years 6 years
Expected volatility of underlying stock 72.90% 67.80% 68.10%
Expected dividend yield 0.00% 0.00% 0.00%
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate     2.10%
2016 Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life of options 6 months 6 months 6 months
Expected dividend yield 0.00% 0.00% 0.00%
2016 Employee Stock Purchase Plan [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 0.09% 1.60% 2.50%
Expected volatility of underlying stock 109.20% 98.30% 76.50%
2016 Employee Stock Purchase Plan [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 0.05% 0.17%  
Expected volatility of underlying stock 77.50% 53.40% 62.90%