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Shareholders Equity and Share Based Compensation - Summary of Stock Option (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2020 $ / shares	Dec. 31, 2019 $ / shares	Dec. 31, 2018 $ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted Average Remaining Contractual Term (years), Beginning balance	10 years
Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Beginning balance | shares	2,452,666		2,164,999		2,337,732
Number of Options, Granted | shares	1,081,488		510,000		203,000
Number of Options, Exercised | shares	(425,166)		(212,332)		(365,733)
Number of Options, Forfeited/expired | shares					(10,000)
Number of Options, Forfeited | shares	(41,666)		(10,001)
Number of Options, Ending balance | shares	3,067,322		2,452,666		2,164,999		2,337,732
Number of Options, Exercisable | shares	1,618,168	1,618,168	1,707,337	1,707,337	1,648,670	1,648,670
Weighted Average Exercise Price, Beginning balance | $ / shares		$ 5.12		$ 2.10		$ 1.59
Weighted Average Exercise Price, Granted | $ / shares		8.77		16.32		5.79
Weighted Average Exercise Price, Exercised | $ / shares		1.36		1.29		0.98
Weighted Average Exercise Price, Forfeited/expired | $ / shares						1.48
Weighted Average Exercise Price, Forfeited | $ / shares		6.93		2.20
Weighted Average Exercise Price, Ending balance | $ / shares		$ 6.91		$ 5.12		$ 2.10
Weighted Average Exercise Price, Exercisable | $ / shares								$ 3.91	$ 1.78	$ 1.43
Weighted Average Remaining Contractual Term (years), Beginning balance	6 years 9 months 25 days		5 years 7 months 6 days		5 years 8 months 8 days		5 years 10 months 20 days
Weighted Average Remaining Contractual Term (years), Granted	9 years 9 months		9 years 2 months 8 days		9 years 5 months 8 days
Weighted Average Remaining Contractual Term (years), Exercised	1 year 7 months 13 days		4 years 10 months 6 days		2 years 8 months 4 days
Weighted Average Remaining Contractual Term (years), Exercisable	4 years 6 months 29 days		4 years 2 months 4 days		4 years 8 months 26 days
Aggregate Intrinsic Value, Beginning balance | $	$ 11,435		$ 5,553		$ 14,125
Aggregate Intrinsic Value, Ending balance | $	20,051		11,435		5,553		$ 14,125
Aggregate Intrinsic Value, Exercisable | $	$ 15,119	$ 15,119	$ 10,736	$ 10,736	$ 5,012	$ 5,012

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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