Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary of Net Cash Proceeds from Exercise of Stock Options Less Shares Used for Minimum Withholding Taxes and Intrinsic Value of Options Exercised (Detail)

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Stock-Based Compensation - Summary of Net Cash Proceeds from Exercise of Stock Options Less Shares Used for Minimum Withholding Taxes and Intrinsic Value of Options Exercised (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Net cash proceeds $ 125 $ 714
Intrinsic value of options exercised $ 353 $ 3,260