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Equity-Based Compensation - Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Options outstanding, Beginning balance 1,360,068 1,199,540  
Options granted 443,200 605,200  
Options exercised   (55,671)  
Options cancelled (105,462) (389,001)  
Options outstanding, Ending balance 1,697,806 1,360,068 1,199,540
Options exercisable, Ending balance 702,956 513,290  
Options outstanding, Weighted Average Exercise Price, Beginning balance $ 39.40 $ 44.64  
Options granted, Weighted Average Exercise Price 33.72 28.50  
Options exercised, Weighted Average Exercise Price   19.05  
Options cancelled, Weighted Average Exercise Price 41.00 40.84  
Options outstanding, Weighted Average Exercise Price, Ending balance 37.81 39.40 $ 44.64
Options exercisable, Weighted Average Exercise Price, Ending balance $ 44.08 $ 48.08  
Options outstanding, Weighted Average Remaining Contractual Term 7 years 11 months 19 days 7 years 6 months 25 days 7 years 3 months 3 days
Options granted, Weighted Average Remaining Contractual Term 9 years 10 months 28 days 9 years 2 months 15 days  
Options exercisable, Weighted Average Remaining Contractual Term, Ending balance 6 years 4 months 9 days 5 years 10 months 17 days  
Options outstanding, Aggregate Intrinsic Value $ 659 $ 1,650 $ 2,717
Options granted, Aggregate Intrinsic Value   1,343  
Options exercised, Aggregate Intrinsic Value   658  
Options cancelled, Aggregate Intrinsic Value 0 0  
Options exercisable, Aggregate Intrinsic Value, Ending balance $ 479 $ 512