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)

v3.19.2
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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Net cash proceeds $ 183 $ 527 $ 308 $ 1,241
Intrinsic value of options exercised $ 527 $ 1,899 $ 880 $ 5,159