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

Inventory (Details Textual)

v3.20.1
Inventory (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Inventory (Textual)      
Write-down of inventory $ 44