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Restructuring Costs - Additional Information (Detail)	1 Months Ended	3 Months Ended		6 Months Ended
Restructuring Costs - Additional Information (Detail)	May 31, 2019 USD ($) Employee	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Restructuring Cost And Reserve [Line Items]
Expected aggregate restructuring charges		$ 661,000		$ 661,000
Restructuring costs		1,376,000		1,376,000
Payments for restructuring		340,000		340,000
Accrued restructuring charges		661,000		661,000
Severance Plan [Member]
Restructuring Cost And Reserve [Line Items]
Number of workforce elimination \| Employee	38
Reduced workforce percentage	25.00%
Expected aggregate restructuring charges	$ 1,500,000
Restructuring costs		1,400,000	$ 0		$ 0
Payments for restructuring		300,000
Accrued restructuring charges		$ 700,000		$ 700,000