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Restructuring - Additional Information (Detail)	1 Months Ended	3 Months Ended	9 Months Ended
Restructuring - Additional Information (Detail)	Apr. 30, 2019 Employee	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Restructuring Cost And Reserve [Line Items]
Remaining liability related to severance			$ 139,000
Accounts Payable and Accrued Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Remaining liability related to severance			100,000
Workforce Reduction [Member]
Restructuring Cost And Reserve [Line Items]
Realignment plan, number of current workforce reduced \| Employee	11
Realignment plan, number of workforce reduced, period percent	41.00%
Realignment plan, employee severance expense		$ 900,000
Cash payments against severance liability			$ 800,000