Segment Information - Net Sales to Significant Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Entity wide revenue, net sales from major customer	$ 37,058	$ 42,186
Wal-Mart
Segment Reporting Information [Line Items]
Entity wide revenue, net sales from major customer	9,939	10,983
Ulta
Segment Reporting Information [Line Items]
Entity wide revenue, net sales from major customer	8,947	$ 9,164
HK NFS
Segment Reporting Information [Line Items]
Entity wide revenue, net sales from major customer	$ 6,401