Stockholders' Equity and Stock-Based Compensation - Summary of Number of Shares of Common Stock Reserved (Detail) - shares shares in Thousands	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for the potential conversion	3,023	3,823
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for the potential conversion	1,529	1,983
Common Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for the potential conversion	1,494	1,840