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Allowance for doubtful accounts
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The allowance for doubtful accounts is determined in respect of specific debts whose collection, in the opinion of the Company's management, is doubtful. Impaired debts are derecognized when they are assessed as uncollectible. As of December 31, 2017 there was no allowance for doubtful accounts and as of December 31, 2016, the balance of allowance for doubtful accounts was $399 thousands.
