Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenue:
Product revenue	$ 118,911		$ 106,447		$ 114,015
Service revenue	47,290		45,214		43,053
Total revenue	166,201		151,661		157,068
Cost of sales	108,208		96,509		95,394
Gross profit	57,993		55,152		61,674
Operating expenses:
Product development and engineering	19,381		15,344		14,486
Selling, general and administrative	42,993		48,599		50,905
Impairment of goodwill	0		1,056		0
Total operating expenses	62,374		64,999		65,391
Operating income (loss)	(4,381)		(9,847)		(3,717)
Interest expense	(526)		(601)		(856)
Gain from settlement of deferred consideration obligation	0		2,314		0
Other income (loss), net	(407)		(54)		30
Income (loss) from continuing operations before income taxes	(5,314)		(8,188)		(4,543)
Provision (benefit) for income taxes	1,508		(1,013)		(1,191)
Income (loss) from continuing operations	(6,822)		(7,175)		(3,352)
Income (loss) from discontinued operations, net of income taxes of $4,588 in 2012, and $5,791 in 2011	0		12,839		(3,474)
Net income (loss)	$ (6,822)		$ 5,664		$ (6,826)
Net income (loss) per share — basic (1):
From continuing operations (dollars per share)	$ (0.91)	[1]	$ (0.92)	[1]	$ (0.43)	[1]
From discontinued operations (dollars per share)	$ 0.00	[1]	$ 1.64	[1]	$ (0.44)	[1]
Net income (loss) per share — basic (in dollars per share)	$ (0.91)	[1]	$ 0.72	[1]	$ (0.87)	[1]
Net income (loss) per share — diluted (1):
From continuing operations (dollars per share)	$ (0.91)	[1]	$ (0.92)	[1]	$ (0.43)	[1]
From discontinued operations (dollars per share)	$ 0.00	[1]	$ 1.64	[1]	$ (0.44)	[1]
Net income (loss) per share — diluted (in dollars per share)	$ (0.91)	[1]	$ 0.72		$ (0.87)	[1]
Weighted average number of shares:
Basic (shares)	7,484		7,813		7,878
Diluted (shares)	7,484		7,817		7,878

[1] Amounts may not add due to rounding.