Consolidated Statements of Operations - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Revenues	$ 55,161,000	$ 73,664,000	$ 79,017,000
Costs and expenses:
Cost of sales	36,367,000	45,107,000	43,889,000
Selling, general and administrative	25,564,000	30,897,000	35,432,000
Restructuring charge	1,428,000	219,000	0
Research and development	4,552,000	4,273,000	1,459,000
Goodwill and intangible assets impairment	2,074,000	1,425,000	23,400,000
Total Costs and Expenses	69,985,000	81,921,000	104,180,000
Operating (loss)	(14,824,000)	(8,257,000)	(25,163,000)
Interest expense	0	(27,000)	(125,000)
Interest income	25,000	21,000	29,000
Other expense	(925,000)	(360,000)	(544,000)
(Loss) before income taxes	(15,724,000)	(8,623,000)	(25,803,000)
Income tax (expense) benefit	(1,664,000)	(3,757,000)	8,078,000
Net (loss)	$ (17,388,000)	$ (12,380,000)	$ (17,725,000)
Net (loss) per common share:
Basic (in dollars per share)	$ (0.74)	$ (0.54)	$ (0.78)
Diluted (in dollars per share)	$ (0.74)	$ (0.54)	$ (0.78)
Weighted-average number of common shares outstanding:
Basic (in shares)	23,365	23,101	22,782
Diluted (in shares)	23,365	23,101	22,782