CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Product sales, net	$ 14,260	$ 10,929	$ 40,574	$ 37,860
Cost of product sales	7,186	6,856	21,965	20,716
Gross profit	7,074	4,073	18,609	17,144
Research and development	2,919	3,443	9,357	11,037
Selling, general and administrative	8,186	7,010	25,427	19,463
Total operating expenses	11,105	10,453	34,784	30,500
Loss from operations	(4,031)	(6,380)	(16,175)	(13,356)
Other income (expense):
(Increase) decrease in fair value of warrants	(1,060)	(203)	(512)	99
Foreign currency translation loss	(6)	(6)	(20)	(17)
Interest income	2	0	6	7
Interest expense	(317)	(86)	(878)	(92)
Other income (expense)	5	0	6	(10)
Total other income (expense)	(1,376)	(295)	(1,398)	(13)
Net loss	$ (5,407)	$ (6,675)	$ (17,573)	$ (13,369)
Net loss per share attributable to common shareholders (Basic and Diluted) (see note 12) (in dollars per share)	$ (0.16)	$ (0.38)	$ (0.54)	$ (0.84)
Weighted average number of common shares outstanding (Basic and Diluted) (in shares)	33,667	22,744	32,783	22,678