Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	6 Months Ended
	Mar. 25, 2020	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage of fair market value of common stock		100.00%	100.00%
Aggregate intrinsic value, options exercised			$ 36	$ 130
Options granted, weighted average grant date fair value (in usd per share)			$ 7.23	$ 11.92
Share based compensation, restricted stock units granted (in shares)			657,981
Employee Stock Option | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)			10 years
Incentive Stock Options And Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares based compensation, vested period (in years)			4 years
Non-Statutory Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares based compensation, vested period (in years)			4 years
Non-Statutory Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares based compensation, vested period (in years)			3 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost of stock based awards		$ 10,700	$ 10,700
Unrecognized compensation cost of stock based awards, recognition period			2 years 7 months 6 days
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted		655,481
2017 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering period (months)			3 months
Shares of common stock issued (in shares)			10,057
2015 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ordinary share issued (in shares)		969,340	969,340
2017 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance		3,980	3,980
Proposed Amendment to the 2017 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of number of common stock outstanding	4.00%
Additional shares authorized (in shares)	474,465
2019 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ordinary share issued (in shares)		400,000	400,000
Shares reserved for issuance		116,750	116,750