Quarterly Financial Information (Details) (USD $)	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information [Line Items]
Revenues	$ 8,552,000		$ 8,726,000		$ 9,317,000		$ 6,713,000		$ 5,803,000		$ 11,558,000		$ 13,003,000		$ 11,280,000		$ 33,308,000	$ 41,644,000
Gross margin	3,631,000		4,006,000		4,074,000		2,939,000		2,334,000		5,081,000		5,529,000		5,235,000		14,650,000	18,179,000
Income (loss) from operations	(2,010,000)	[1]	(961,000)	[1]	(1,171,000)	[1]	(2,024,000)	[1]	(2,712,000)	[2]	(589,000)	[2]	98,000	[2]	92,000	[2]	(6,166,000)	(3,111,000)
Net income (loss)	(2,048,000)		(774,000)		(1,200,000)		(2,146,000)		(6,499,000)	[3]	(447,000)	[3]	143,000	[3]	92,000	[3]	(6,168,000)	(6,711,000)
Net income (loss) per share - Basic	$ (0.31)	[4]	$ (0.11)	[4]	$ (0.17)	[4]	$ (0.31)	[4]	$ (0.93)	[4]	$ (0.06)	[4]	$ 0.02	[4]	$ 0.01	[4]	$ (0.91)	$ (0.97)
Net income (loss) per share - Diluted	$ (0.31)	[4]	$ (0.11)	[4]	$ (0.17)	[4]	$ (0.31)	[4]	$ (0.93)	[4]	$ (0.06)	[4]	$ 0.02	[4]	$ 0.01	[4]	$ (0.91)	$ (0.97)
Restructuring and severance costs																	952,000	740,000
Non-cash charge to record a valuation allowance against our deferred tax assets																		5,700,000
Fourth Quarter 2012 Workforce Reduction [Member]
Quarterly Financial Information [Line Items]
Restructuring and severance costs																		523,000
Semiconductor R&D Consolidation [Member]
Quarterly Financial Information [Line Items]
Restructuring and severance costs																		$ 217,000

[1] Includes a restructuring and severance charge of $952,000 in the fourth quarter of 2013.

[2] Includes restructuring charges of $217,000 in the third quarter and $523,000 in the fourth quarter of 2012.

[3] Includes a $5.7 million non-cash charge in the fourth quarter of 2012 to record a valuation allowance against our deferred tax assets

[4] The summation of quarterly per share amounts may not equal the calculation for the full year, as each quarterly calculation is performed discretely.