Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of Significant Accounting Policies [Abstract]
Term of warranty	1 year
Period of post customer support service (PCS)	1 year
Cash and Cash Equivalents [Abstract]
Money market accounts	$ 16,400,000	$ 8,200,000
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balance	136,000	2,040,000	1,746,000
Current year provision	0	(230,000)	294,000	1,600,000
Current year write-offs	(134,000)	(1,674,000)	0
Ending balance	2,000	136,000	2,040,000	1,746,000
Development Expenditures [Abstract]
Development Expenditures	2,400,000	1,800,000	1,600,000
Foreign Currency Translation [Abstract]
Foreign currency transaction gains (losses)	313,000	(136,000)	(297,000)
Product Warranty [Roll Forward]
Beginning balance	2,300,000	1,680,000	1,273,000
Current year provision	993,000	987,000	718,000
Current year claims	(1,215,000)	(352,000)	(330,000)
Currency adjustment	29,000	(15,000)	19,000
Ending balance	2,107,000	2,300,000	1,680,000	1,273,000
Stock-Based Compensation [Abstract]
Share based compensation expense	914,000	727,000	807,000
Unrecognized compensation expense	2,200,000
Numerator: [Abstract]
Net income (loss) attributed to common stockholders	$ 1,174,000	$ 2,801,000	$ (2,249,000)
Denominator: [Abstract]
Weighted-average shares outstanding for basic earnings per share (in shares)	18,383,564	18,952,401	18,975,007
Effect of Dilutive Securities: [Abstract]
Employee stock options and warrants (in shares)	74,893	170,502	0
Adjusted weighted-average shares outstanding and assumed conversions for diluted earnings per share (in shares)	18,458,457	19,122,903	18,975,007
Shares related to dilutive securities excluded because inclusion would be anti-dilutive (in shares)	2,885,809	1,701,794	1,679,907
In the money options and warrants (in shares)			518,546