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Leases - Additional Information (Detail)
12 Months Ended
Dec. 31, 2019
USD ($)
Maximum [Member]  
Operating Leases, Rent Expense $ 200,000
Lease Expiration Date Dec. 31, 2038
Minimum [Member]  
Operating Leases, Rent Expense $ 11,000
Lease Expiration Date Dec. 31, 2020