Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statements of Operations
Net sales	$ 20,734	$ 38,106	$ 44,733
Cost of goods sold	6,880	10,654	11,500
Gross profit	13,854	27,452	33,233
Operating expenses:
Sales and marketing	20,607	25,762	23,599
Research and development	9,704	7,199	4,707
General and administrative	23,577	18,738	10,712
Goodwill impairment		14,278
Total operating expenses	53,888	65,977	39,018
Loss from operations	(40,034)	(38,525)	(5,785)
Other income (expense), net:
Interest income	63	32
Interest expense	(98)	(3,097)	(2,172)
Other (expense) income, net	(36)	360	2,146
Total other income (expense), net	(71)	(2,705)	(26)
Loss before income taxes	(40,105)	(41,230)	(5,811)
Income taxes	61
Net loss	$ (40,166)	$ (41,230)	$ (5,811)
Basic and diluted net loss per share attributable to common stockholders (in dollars per share)	$ (2.20)	$ (2.61)	$ (2.28)
Weighted average outstanding common shares used for net loss per share attributable to common stockholders:
Basic and diluted (in shares)	18,233,177	15,770,972	2,545,371