Condensed Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Product sales	$ 8,323	$ 6,346	$ 22,405	$ 18,335
Licensing and royalty revenue	75	156	379	299
Total revenue	9,008	7,164	25,813	20,030
Cost of sales	3,753	2,859	10,549	8,563
Gross profit	5,255	4,305	15,264	11,467
Operating expenses:
Research and development	6,420	3,111	19,236	14,342
General and administrative	3,031	1,586	8,669	4,881
Sales and marketing	1,112	788	3,331	2,476
Total operating expenses	10,563	5,485	31,236	21,699
Loss from operations	(5,308)	(1,180)	(15,972)	(10,232)
Interest expense	(178)	(798)	(584)	(1,982)
Other income, net	40	534	83	814
Loss on extinguishment of debt			(246)
Net loss and comprehensive loss	$ (5,446)	$ (1,444)	$ (16,719)	$ (11,400)
Net loss per common share, basic and diluted	$ (0.43)	$ (0.54)	$ (1.35)	$ (4.40)
Weighted-average shares used to compute net loss per common share, basic and diluted	12,559,812	2,657,574	12,425,390	2,589,704
Related Party
Product sales	$ 610	$ 662	$ 1,810	$ 1,396
Licensing and royalty revenue			$ 1,219