Condensed Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Condensed Statements of Operations
Net sales	$ 6,244	$ 14,206	$ 7,715	$ 26,640
Cost of goods sold	1,745	3,937	2,506	7,174
Gross profit	4,499	10,269	5,209	19,466
Operating expenses:
Sales and marketing	6,287	6,951	11,396	13,805
Research and development	3,062	1,497	5,317	2,753
General and administrative	5,357	3,943	10,642	7,664
Total operating expenses	14,706	12,391	27,355	24,222
Loss from operations	(10,207)	(2,122)	(22,146)	(4,756)
Other income (expense), net:
Interest income	16	7	31	7
Interest expense	(12)	(671)	(13)	(1,339)
Other income (expense), net	10	(206)	(2)	(288)
Total other income (expense), net	14	(870)	16	(1,620)
Loss before income taxes	(10,193)	(2,992)	(22,130)	(6,376)
Net loss	$ (10,193)	$ (2,992)	$ (22,130)	$ (6,376)
Basic and diluted net loss per share attributable to common stockholders (in dollars per share)	$ (0.56)	$ (0.20)	$ (1.23)	$ (0.43)
Weighted average outstanding common shares used for net loss per share attributable to common stockholders:
Basic and diluted (in shares)	18,075,010	14,931,931	18,062,803	14,927,558