Stock Award Plans and Stock-Based Compensation - Additional Information (Details)	9 Months Ended
	Sep. 30, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price limit (percent)	100.00%
Exercise price limit for individuals owning over ten percent (percent)	110.00%
Aggregate number of shares available for future grant under stock option plan	2,320,337
2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants during period (in shares)	81
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2018 Plan aggregate number of options authorized (in shares)	18,730,073
Stock option grants during period (in shares)	16,409,818
Non Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non plan stock options granted (in shares)	1
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted under the option plans vest over periods	4 years
Option life under the plan	10 years