Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

4. Depreciation, Bad Debt and Other Provisions (Tables)

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4. Depreciation, Bad Debt and Other Provisions (Tables)
12 Months Ended
Dec. 31, 2018
Depreciation And Bad Debt Provision Tables Abstract  
Schedule of depreciation and bad debt provision
      2018       2017       2016*  
Depreciation of property and equipment   $ 3,508     $ 3,574     $ 3,229  
Bad debt and other provisions     39,340       63,954        
Total depreciation, bad debt and other provisions   $ 42,848     $ 67,528     $ 3,229