Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue:
Total revenue	$ 23,286	$ 12,703
Cost of revenue:
Total cost of revenue	10,946	7,186
Gross profit	12,340	5,517
Operating expenses:
Research and development	2,387	2,900
Selling, general and administrative	14,935	8,236
Total operating expenses	17,322	11,136
Operating loss	(4,982)	(5,619)
Interest expense	(661)	(631)
Other income	104	57
Net loss	$ (5,539)	$ (6,193)
Basic and diluted net loss per common share	$ (0.03)	$ (0.04)
Basic and diluted weighted average common shares outstanding	160,446	156,724
Product sales [Member]
Revenue:
Total revenue	$ 18,300	$ 10,949
Cost of revenue:
Total cost of revenue	10,568	6,536
Licensing and Development Revenue [Member]
Revenue:
Total revenue	915	1,285
Royalties [Member]
Revenue:
Total revenue	4,071	469
Cost of development revenue [Member]
Cost of revenue:
Total cost of revenue	$ 378	$ 650