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LEASES - Schedule of Maturities the Company's of Lease Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Operating    
2021 $ 1,083  
2022 1,114 $ 1,615
2023 812 1,186
2024 623 881
2025 511 702
Thereafter 973  
2024   595
Thereafter   1,092
Total 5,116 6,071
Less: Interest (1,198) (1,448)
Present value of lease liabilities $ 3,918 $ 4,623
Operating Lease Liability Statement Of Financial Position [Extensible List] ston:AccountsPayablesAndAccruedLiabilitiesCurrentAndOtherLiabilitiesNoncurrent ston:AccountsPayableAndAccruedLiabilitiesPolicyTextBlock
Finance    
2021 $ 1,340  
2022 1,878 $ 1,791
2023 619 1,939
2024 83 643
2025 33 107
2024   33
Total 3,953 4,513
Less: Interest (405) (505)
Present value of lease liabilities $ 3,548 $ 4,008