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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 13,381	$ 11,683	$ 39,756	$ 34,214
Cost of goods sold	1,221	1,328	3,451	3,894
Gross profit	12,160	10,355	36,305	30,320
Operating expenses:
Sales and marketing	10,605	9,857	31,890	30,987
Research and development	1,373	1,466	3,875	4,234
General and administrative	3,226	4,071	8,198	10,808
Total operating expenses	15,204	15,394	43,963	46,029
Loss from operations	(3,044)	(5,039)	(7,658)	(15,709)
Interest and other income (expense), net:
Interest income	69	44	199	117
Interest expense	(1,282)	(1,005)	(3,826)	(2,925)
Other income (expense), net	(535)	317	(855)	383
Net loss	(4,792)	(5,683)	(12,140)	(18,134)
Other comprehensive income:
Changes in foreign currency translation	(4)	(25)	29	(60)
Comprehensive loss	$ (4,796)	$ (5,708)	$ (12,111)	$ (18,194)
Net loss per share, basic and diluted (in dollars per share)	$ (1.29)	$ (1.64)	$ (3.34)	$ (5.26)
Weighted-average number of common shares used to compute basic and diluted net loss per share (in shares)	3,712,876	3,475,628	3,638,905	3,450,252

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