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Stock Award Plans - Additional Information (Detail) - USD ($)		12 Months Ended
	Aug. 27, 2020	Dec. 31, 2020	Dec. 31, 2019	May 31, 2020	May 16, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		$ 6,511,000	$ 6,203,000
Weighted average grant date fair value of the stock options granted		$ 970,000	$ 1,320,000
Weighted average grant date fair value of the stock options vested		$ 4,500,000	$ 3,400,000
Total intrinsic value of options exercised		$ 500,000
Cash received from the exercise of options		600,000	$ 100,000
Total fair value of restricted stock units vested		2,500,000	1,100,000
Total grant date fair value of restricted stock units outstanding		13,300,000	2,300,000
Issuance of common stock under Employee Stock Purchase Plan		684,000	656,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under Employee Stock Purchase Plan		$ 6,000	$ 7,000
Issuance of common stock under Employee Stock Purchase Plan (in shares)		627,000	653,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance		1,600,000
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		3 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
Unrecognized compensation expense, weighted average period for recognition		2 years 29 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		$ 3.77
Vesting date		May 22, 2023
Common stock price per share	$ 1.70
Risk-free interest rate	0.18%
Volatility	95.00%
Dividend yield	0.00%
Unrecognized compensation expense related to non-option		$ 11,000,000.0
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		$ 6,200,000	$ 5,800,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		300,000	$ 400,000
Performance-based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost		200,000
Unrecognized compensation expense related to options		400,000
Options and Performance-based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to options		$ 4,800,000
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