Inventories (Details Textual)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Inventories [Abstract]
Percentage of finished goods in non-current inventories	39.00%	51.00%
Description of inventory's method	Inventories are stated at the lower of cost, determined by the first-in, first-out ("FIFO") method, or net realizable value.