Description of Business and Basis of Presentation (Details Textual)	3 Months Ended
	Mar. 31, 2016 USD ($) manufacturing_location contract_manufacturer Segment product_line	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Description of Business and Basis of Presentation (Textual) [Abstract]
Manufacturing locations | manufacturing_location	3
Operating segments | Segment	1
Number of product lines | product_line	3
Restricted cash	$ 400,000	$ 400,000
Cumulative valuation allowance	68,100,000
Deferred tax liability recorded associated with unremitted earnings of foreign subsidiary no longer considered indefinitely reinvested	3,700,000
Undistributed earnings of Swiss subsidiary	$ 73,500,000
Warranty period, minimum, in years	1 year
Warranty period, maximum, in years	8 years
Accrued warranty liability	$ 1,200,000	1,300,000
Deferred revenue and customer deposits	3,375,000	3,066,000
Cash and cash equivalents	21,589,000	$ 24,382,000	$ 23,101,000	$ 24,732,000
Working capital amount	62,100,000
Revolving Credit Facility | East West Bank
Description of Business and Basis of Presentation (Textual) [Abstract]
Revolving line of credit	25,000,000
Amount available under revolving line of credit	18,100,000
Drawings under revolving line of credit	$ 0
China
Description of Business and Basis of Presentation (Textual) [Abstract]
Number of contract manufacturers | contract_manufacturer	2
Maximum | Revenue from Production Type Contracts
Description of Business and Basis of Presentation (Textual) [Abstract]
Percentage of total revenue from production type contracts (less than five percent)	5.00%