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Stockholder's Equity - Summary of Restricted Stock Unit Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Class Of Stock [Line Items]  
Restricted Stock Units and Common Units, Unvested | shares 1,348
Restricted Stock Units and Common Units, Vested | shares (636)
Resticted Stock Units and Common Units, Forfeited | shares (87)
Restricted Stock Units and Common Units, Unvested | shares 625
Weighted Average Grant Date Fair Value, Unvested | $ / shares $ 16,176
Weighted Average Grant Date Fair Value, Unvested | $ / shares 7,632
Weighted Average Grant Date Fair Value, Unvested | $ / shares 1,044
Weighted Average Grant Date Fair Value, Unvested | $ / shares $ 7,500
2017 Plan [Member] | Restricted Stock Unit Activity [Member]  
Class Of Stock [Line Items]  
Restricted Stock Units and Common Units, Granted | shares 1,899
Restricted Stock Units and Common Units, Vested | shares (174)
Resticted Stock Units and Common Units, Forfeited | shares (51)
Restricted Stock Units and Common Units, Unvested | shares 1,674
Weighted Average Grant Date Fair Value, Unvested | $ / shares $ 14.33
Weighted Average Grant Date Fair Value, Unvested | $ / shares 11.19
Weighted Average Grant Date Fair Value, Unvested | $ / shares 10.51
Weighted Average Grant Date Fair Value, Unvested | $ / shares $ 14.77
Aggregate Intrinsic Value, Granted | $ $ 27,216
Aggregate Intrinsic Value, Vested | $ 2,712
Aggregate Intrinsic Value, Forfeited | $ 1,077
Aggregate Intrinsic Value, Unvested | $ $ 22,012
Remaining Contractual Life, Outstanding 4 years 21 days