Description of Business and Basis of Presentation (Details Textual)	9 Months Ended
	Sep. 30, 2015 USD ($) manufacturing_location contract_manufacturer Segment product_line	Jul. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)
Description of Business and Basis of Presentation (Textual) [Abstract]
Manufacturing locations | manufacturing_location	3
Operating segments | Segment	1
Cumulative valuation allowance	$ 64,200,000
Warranty period, minimum, in years	1 year
Warranty period, maximum, in years	8 years
Accrued warranty liability	$ 1,091,000		$ 716,000
Deferred revenue and customer deposits	1,206,000		703,000
Cash and cash equivalents	24,813,000		24,732,000	$ 30,798,000	$ 30,647,000
Working capital amount	65,500,000
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 the Revolving Line of Credit	20,400,000
Drawings under revolving line of credit	$ 0
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%
Deposit
Description of Business and Basis of Presentation (Textual) [Abstract]
Restricted cash balance on deposit	$ 400,000
Scenario, Adjustment | Change in Estimate of Foreign Earnings Permanently Invested
Description of Business and Basis of Presentation (Textual) [Abstract]
Deferred tax liability recorded associated with unremitted earnings of foreign subsidiary no longer considered indefinitely reinvested	2,100,000		1,600,000
Unremitted earnings of foreign subsidiary	$ 41,700,000		$ 31,800,000
High Reliability
Description of Business and Basis of Presentation (Textual) [Abstract]
Number of product lines | product_line	3
China
Description of Business and Basis of Presentation (Textual) [Abstract]
Number of contract manufacturers | contract_manufacturer	2