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Stock-Based Compensation - Summary of Stock-Based Compensation Activity (Detail) - 2008 Plan, 2015 Plan and 2018 Plan [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Options Outstanding, Shares Available for Grant        
Shares Available for Grant, Beginning balance   1,117,796    
Shares Available for Grant, Awards authorized   945,139    
Shares Available for Grant, Granted   (869,460)    
Shares Available for Grant, forfeited/cancelled   199,701    
Shares Available for Grant, Ending balance   1,393,176   1,117,796
Options Outstanding, Number of Shares Outstanding        
Number of Shares Outstanding, Beginning balance   4,146,928    
Number of Shares Outstanding, Options granted   869,460    
Number of Shares Outstanding, Options exercised 0 (30,218) 0  
Number of Shares Outstanding, Options forfeited/cancelled   (199,701)    
Number of Shares Outstanding, Ending balance   4,786,469   4,146,928
Number of Shares Outstanding, Exercisable   955,199    
Number of Shares Outstanding, Vested and expected to vest   4,261,231    
Options Outstanding, Weighted-Average Exercise Price Per Share        
Weighted-Average Exercise Price Per Share, Beginning balance   $ 19.45    
Weighted-Average Exercise Price Per Share, Options granted   16.87    
Weighted-Average Exercise Price Per Share, Options exercised   13.29    
Weighted-Average Exercise Price Per Share, Options forfeited/cancelled   17.43    
Weighted-Average Exercise Price Per Share, Ending balance   19.11   $ 19.45
Weighted-Average Exercise Price Per Share, Exercisable   39.28    
Weighted-Average Exercise Price Per Share, Vested and expected to vest   $ 19.96    
Options Outstanding, Weighted-Average Remaining Contractual Term (Years)        
Weighted-Average Remaining Contractual Term (Years)   8 years 6 months 21 days   8 years 10 months 2 days
Weighted-Average Remaining Contractual Term (Year), Exercisable   6 years 1 month 6 days    
Weighted-Average Remaining Contractual Term (Year), Vested and expected to vest   8 years 5 months 23 days    
Options Outstanding, Aggregate Intrinsic Value of Outstanding Options        
Aggregate Intrinsic Value of Outstanding Options   $ 26,418   $ 12,227
Aggregate Intrinsic Value of Outstanding Options, Exercisable   4,149    
Aggregate Intrinsic Value of Outstanding Options, Vested and expected to vest   $ 22,573