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Percentile rank of shareholder return of stock.

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Share based compensation arrangement by share based payment award number of shares available for grant increased by shares.

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Share based compensation arrangement by share based payment award target percentage.

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Net number of share options (or share units) granted during the period.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Price of a single share of a number of saleable stocks of a company.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock Award Plans - Additional Information (Detail) - USD ($)		12 Months Ended
	May 17, 2021	Dec. 31, 2021	Dec. 31, 2020	May 31, 2020	May 16, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		$ 12,200,000	$ 6,511,000
Options issued or granted		0
Weighted average grant date fair value of the stock options granted			$ 970,000
Weighted average grant date fair value of the stock options vested		$ 2,300,000	$ 4,500,000
Total intrinsic value of options exercised		$ 1,700,000	$ 500,000
Cash received from the exercise of options		1,000,000.0	600,000
Total fair value of restricted stock units vested		6,700,000	2,500,000
Total grant date fair value of restricted stock units outstanding		19,300,000	13,300,000
Issuance of common stock under Employee Stock Purchase Plan		1,090,000	684,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under Employee Stock Purchase Plan		$ 5,000	$ 6,000
Issuance of common stock under Employee Stock Purchase Plan (in shares)		527,000	627,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance		1,100,000
Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under Employee Stock Purchase Plan		$ 25,000
Issuance of common stock under Employee Stock Purchase Plan (in shares)		5,000
Employee \| ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount on purchase price percentage of fair market value		8500.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		10 years
Unrecognized compensation expense, weighted average period for recognition		2 years 7 months 2 days
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
Unrecognized compensation expense, weighted average period for recognition		1 year 3 months 25 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		36 months
Vesting rights percentage		25.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
Restricted Stock \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage		25.00%
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share		$ 9.30
Vesting date		May 17, 2024
Common stock price per share	$ 4.26
Risk-free interest rate	0.34%
Volatility	88.00%
Dividend yield	0.00%
Unrecognized compensation expense related to non-option		$ 21,100,000
RSUs \| Less than 25th Percentile
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentile		25.00%
Percent of target		0.00%
RSUs \| 25th Percentile
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentile		25.00%
Percent of target		50.00%
RSUs \| 50th Percentile
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentile		50.00%
Percent of target		100.00%
RSUs \| 75th Percentile
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentile		75.00%
Percent of target		200.00%
RSUs \| 90th Percentile or Higher
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentile		90.00%
RSUs \| Maximum \| 90th Percentile or Higher
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of target		300.00%
RSUs and Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		$ 11,500,000	$ 6,200,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		700,000	300,000
Performance-based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost		100,000	200,000
Unrecognized compensation expense related to options		300,000	$ 400,000
Options and Performance-based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to options		$ 2,100,000
2018 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity incentive plan, shares					12,000,000
Equity incentive plan, number of shares available for grant increased by shares				12,500,000
Exercise or strike price of fair market value of underlying common stock on date of grant reacquired or withheld				100.00%
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity incentive plan, shares					0