6. Accounts receivables, net Included in accounts receivables, net for the periods indicated was the allowance for doubtful accounts, which consisted of the following: | | | | | | Allowance for | | | Doubtful Accounts | Balance, December 31, 2017 | | $ | 863 | Additions charged to operations | | | 363 | Deductions from reserves, net | | | (43) | Balance, December 31, 2018 | | | 1,183 | Additions charged to operations | | | 181 | Deductions from reserves, net | | | (278) | Balance, December 31, 2019 | | | 1,086 | Additions charged to operations | | | 28 | Deductions from reserves, net | | | (106) | Balance, December 31, 2020 | | $ | 1,008 |
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