Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended								12 Months Ended			0 Months Ended	12 Months Ended	13 Months Ended	0 Months Ended	5 Months Ended	0 Months Ended	6 Months Ended
	Apr. 08, 2013	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 20, 2012	Dec. 03, 2013	Dec. 31, 2013	Aug. 15, 2013	Dec. 31, 2013	Dec. 16, 2014	Dec. 31, 2014	Jun. 30, 2014	Aug. 16, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Asset Impairment Charges										$ 0	$ 0	$ 0
Money Market Funds, at Carrying Value		14,001,000				10,606,000				14,001,000	10,606,000				10,606,000		10,606,000		14,001,000
Stipulation of settlement, payment to plaintiff, warrants	250,000	250,000								250,000									250,000
Expected volatility rate										41.00%
Risk free interest rate										1.50%
Stipulation of Settlement, payment to plaintiff, warrants, term	5 years									5 years
Warrants, fair value per share		6.59								6.59									6.59
Fair Value Adjustment Of Warrants					400,000
Warrants exercised		152,500
Warrants outstanding		97,500								97,500									97,500
Prepaid expenses included in other assets		4,700,000				4,200,000				4,700,000	4,200,000				4,200,000		4,200,000		4,700,000
Cost of sales related to product revenue										82,600,000	74,100,000	62,900,000
Cost of sales related to service revenue										33,700,000	34,100,000	33,600,000
Capitalized costs for internally developed software										0
Advertising Expense										1,200,000	1,100,000	1,200,000
Purchase of treasury shares, value											3,884,000	3,257,000
Share price		$ 9.93								$ 9.93									$ 9.93
Revenue		43,444,000	43,170,000	43,124,000	42,318,000	50,736,000	38,385,000	38,175,000	38,905,000	172,056,000	166,201,000	151,661,000
Net income (loss)		(4,631,000)	(1,040,000)	(2,267,000)	(4,217,000)	(1,249,000)	(146,000)	(993,000)	(4,434,000)	(12,155,000)	(6,822,000)	5,664,000
Cost of sales		30,415,000	28,454,000	28,342,000	29,067,000	34,116,000	23,411,000	24,803,000	25,878,000	116,278,000	108,208,000	96,509,000
Gross profit		13,029,000	14,716,000	14,782,000	13,251,000	16,620,000	14,974,000	13,372,000	13,027,000	55,778,000	57,993,000	55,152,000
Provision for income taxes		2,644,000	727,000	681,000	251,000	1,075,000	12,000	115,000	306,000	4,303,000	1,508,000	(1,013,000)
Inventories		21,683,000				22,981,000				21,683,000	22,981,000				22,981,000		22,981,000		21,683,000
Deferred revenue										3,459,000	3,146,000	155,000
Deferred income taxes		535,000				1,219,000				535,000	1,219,000				1,219,000		1,219,000		535,000
Accumulated deficit		(1,220,492,000)				(1,208,337,000)				(1,220,492,000)	(1,208,337,000)				(1,208,337,000)		(1,208,337,000)		(1,220,492,000)
Inventories										(82,000)	43,000	689,000
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)										309,309	325,837	420,693
August 2012 Share Repurchase Agreement [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Purchase of treasury shares, shares													292,171
Treasury Stock Acquired, Average Cost Per Share													$ 9.60
Purchase of treasury shares, value													2,800,000
Common stock, discount on shares, percent													7.70%
Share price																					$ 10.40
December 2012 Share Repurchase Agreement [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Purchase of treasury shares, shares											261,873	40,305			302,178
Purchase of treasury shares, value											2,600,000	400,000			3,000,000
Stock repurchase program, authorized amount														10,000,000
August 2013 Share Repurchase Agreement [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Purchase of treasury shares, shares										0							127,510
Purchase of treasury shares, value																	1,300,000
Stock repurchase program, authorized amount																7,013,838
December 2014 Share Repurchase Agreement [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock repurchase program, authorized amount																		8,000,000
Fair Value, Inputs, Level 1 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		14,001,000				10,606,000				14,001,000	10,606,000				10,606,000		10,606,000		14,001,000
United States [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Cash and cash equivalents		13,300,000								13,300,000									13,300,000
Revenue										51,036,000	55,071,000	47,250,000
Foreign [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Cash and cash equivalents		9,100,000								9,100,000									9,100,000
Restatement Adjustment [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Revenue																			1,400,000	(2,000,000)
Net income (loss)																			100,000	(100,000)
Cost of sales																				(1,800,000)
Gross profit										(100,000)										(200,000)
Provision for income taxes																				(100,000)
Inventories				1,900,000																1,900,000
Deferred revenue										(600,000)										2,000,000
Deferred income taxes				100,000																100,000
Accumulated deficit		(100,000)		(100,000)						(100,000)									(100,000)	(100,000)
Inventories										(500,000)
Software License Arrangement [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Impairment of intangible assets										$ 100,000