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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Net cash proceeds $ 6 $ 887 $ 314 $ 2,128
Intrinsic value of options exercised $ 13 $ 1,257 $ 893 $ 6,416