Condensed Statements of Operations - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales	$ 7,489,000	$ 1,471,000
Cost of goods sold	2,322,000	760,000
Gross profit	5,167,000	711,000
Operating expenses:
Sales and marketing	6,955,000	5,109,000
Research and development	3,194,000	2,255,000
General and administrative	6,436,000	5,286,000
Total operating expenses	16,585,000	12,650,000
Loss from operations	(11,418,000)	(11,939,000)
Other income (expense), net:
Interest income	22,000	15,000
Interest expense	(9,000)	(1,000)
Other income (expense), net	8,000	(12,000)
Total other income (expense), net	21,000	2,000
Loss before income taxes	(11,397,000)	(11,937,000)
Income taxes	25,000	0
Net loss	$ (11,422,000)	$ (11,937,000)
Basic and diluted net loss per share attributable to common stockholders	$ (0.61)	$ (0.66)
Weighted average outstanding common shares used for net loss per share attributable to common stockholders:
Basic and diluted	18,772,965	18,050,597