Description of Business and Basis of Presentation (Details Textual)	9 Months Ended
	Sep. 30, 2016 USD ($) manufacturing_location contract_manufacturer segment product_line	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Description of Business and Basis of Presentation (Textual) [Abstract]
Manufacturing locations | manufacturing_location	2
Operating segments | segment	1
Number of product lines | product_line	2
Restricted cash	$ 100,000	$ 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	$ 1,305,000	1,288,000	$ 1,040,000	$ 716,000
Deferred revenue and customer deposits	3,079,000	3,066,000
Cash and cash equivalents	27,802,000	$ 24,382,000	$ 24,813,000	$ 24,732,000
Working capital amount	61,900,000
Revolving Credit Facility | East West Bank
Description of Business and Basis of Presentation (Textual) [Abstract]
Revolving line of credit	25,000,000
Drawings under revolving line of credit	0
Amount available under revolving line of credit	$ 10,700,000
Revenue from Production Type Contracts | Maximum
Description of Business and Basis of Presentation (Textual) [Abstract]
Percentage of total revenue from production type contracts (less than five percent)	5.00%
China
Description of Business and Basis of Presentation (Textual) [Abstract]
Number of contract manufacturers | contract_manufacturer	2