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Leases - Schedule of Balance Sheet Operating Leases (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Assets:    
Operating lease right-of-use asset $ 181 $ 227
Liabilities:    
Operating lease liability - current portion 111 113
Operating lease liability - long term portion 91 144
Total operating lease liabilities $ 202 $ 257