Consolidated Statements of Operations - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Net product revenue	$ 6,862,000	$ 6,102,000
Cost of revenue	2,824,000	2,183,000
Gross profit	4,038,000	3,919,000
Operating expenses:
Sales and marketing	1,531,000	1,637,000
Research and development	2,162,000	2,499,000
General and administrative	1,094,000	1,190,000
Operating loss	(749,000)	(1,407,000)
Interest expense, net	(209,000)	(145,000)
Other income	928,000
Loss from operations before income taxes	(30,000)	(1,552,000)
Income tax provision
Net loss	(30,000)	(1,552,000)
Preferred stock dividends accrued	(139,000)	(139,000)
Net loss attributable to common stockholders	$ (169,000)	$ (1,691,000)
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.01)	$ (0.13)
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.01)	$ (0.13)
Weighted average common shares outstanding:
Basic (in shares)	12,836	12,737
Diluted (in shares)	12,836	12,737