Stock-Based Compensation - Additional Information (Detail) - 2016 Omnibus Stock Plan - USD ($)	1 Months Ended
	May 31, 2020	Sep. 30, 2020
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non option equity instruments granted per director (in shares)	329
Non option equity instruments market value	$ 75,000
Non option equity instruments grant date fair value per grant	56,250
Non option equity instruments grant date fair value total	$ 450,000
Non option equity instruments, outstanding, number (in shares)		14,916
Shares available for future grant under the plan (in shares)		490,871
Newly Appointed Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional non option equity instruments granted per director (in shares)	876
Additional non option equity instruments market value	$ 200,000
Additional non option equity instruments grant date fair value total	$ 150,000