Accounts Receivable (Tables)
|12 Months Ended|
Dec. 31, 2018
|Accounts Receivable, Net [Abstract]|
|Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]||
As of December 31, 2018 and 2017, accounts receivable consisted of the following:
Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef