Stock-Based Compensation - Stock Options - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercised	2,420	19,606
Intrinsic value based on share price	$ 5.67
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options vesting provisions, description	Employee options are subject to installment vesting and although the vesting may vary from year to year, it is typically over a period of three years.
Options vested in remaining period	3 years
Period of termination of employment	180 days
Stock options granted period	10 years
Options Granted	0	0
Options exercised	6,000	61,767
Intrinsic value	$ 53	$ 100
Period of expected life, options granted	5 years
Stock Options [Member] | Stock Option Plan One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from options exercised	$ 8	$ 100
Options exercised		9,412
Stock Options [Member] | Stock Option Plan Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued	1,420	10,194
Options exercised	6,000	52,355