Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 36,542,000	$ 20,734,000	$ 38,106,000
Cost of goods sold	14,171,000	6,880,000	10,654,000
Gross profit	22,371,000	13,854,000	27,452,000
Operating expenses:
Sales and marketing	33,911,000	20,607,000	25,762,000
Research and development	9,813,000	9,704,000	7,199,000
General and administrative	31,537,000	21,959,000	18,738,000
Legal settlement	10,000,000	1,618,000
Goodwill impairment			14,278,000
Total operating expenses	85,261,000	53,888,000	65,977,000
Loss from operations	(62,890,000)	(40,034,000)	(38,525,000)
Other income (expense), net:
Interest income	172,000	63,000	32,000
Interest expense	(1,232,000)	(98,000)	(3,097,000)
Other income (expense), net	(95,000)	(36,000)	360,000
Total other income (expense), net	(1,155,000)	(71,000)	(2,705,000)
Loss before income taxes	(64,045,000)	(40,105,000)	(41,230,000)
Income tax (benefit) expense	(17,000)	61,000	0
Net loss	$ (64,028,000)	$ (40,166,000)	$ (41,230,000)
Basic and diluted net loss per share attributable to common stockholders	$ (3.34)	$ (2.20)	$ (2.61)
Weighted average outstanding common shares used for net loss per share attributable to common stockholders:
Basic and diluted	19,159,057	18,233,177	15,770,972