Business Segment Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($) segment
Business Segment Information
Number of reportable segments | segment	1	1	1
Total net sales	$ 114,397	$ 71,700	$ 45,587
Property and equipment, net	7,593	2,154	1,950
Depreciation and amortization	4,722	4,267	4,231
Capital expenditures	6,549	1,034	817
United States
Business Segment Information
Total net sales	104,995	67,698	42,932
Property and equipment, net	7,463	2,012	1,784
Depreciation and amortization	4,654	4,180	4,149
Capital expenditures	6,493	972	749
International
Business Segment Information
Total net sales	9,402	4,002	2,655
Property and equipment, net	130	142	166
Depreciation and amortization	68	87	82
Capital expenditures	$ 56	$ 62	$ 68