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Organization and Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share, Unvested Restricted Stock Awards (Detail) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Excluded unvested restricted stock awards 1,112,293 1,112,293 981,783
Unvested Restricted Stock Awards Excluded from EPS [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Excluded unvested restricted stock awards 249,391 41,667 41,667