Quarterly report pursuant to Section 13 or 15(d)

Stock Option and Incentive Plans - Additional Information (Detail)

Stock Option and Incentive Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2015	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 13, 2021	Jul. 28, 2014	Apr. 29, 2014	Feb. 24, 2014	Feb. 26, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved pursuant to the plan	14,903,919		14,876,155		14,876,155
Weighted average grant date fair value of options			$ 0.3	$ 3.93	$ 3.06	$ 4.31
Unrecognized compensation cost related to unvested stock options			$ 5.7		$ 5.7
Weighted average period of unvested stock options					2 years 1 month 28 days
Employee Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized			$ 1.0	$ 0.9	$ 2.9	$ 2.4
Amended and Restated 2008 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved pursuant to the plan											157,143
Termination of service, Period					2 years
2008 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved pursuant to the plan									235,714	185,714
Termination of service, Period					10 years
2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved pursuant to the plan								57,143
Number of additional shares increases of common stock reserved pursuant to the plan	4,268,682
2014 Omnibus Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual increase of plan, percentage of common stock shares outstanding		4.00%
2021 Employment Inducement Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved pursuant to the plan							1,000,000