Description of Business and Basis of Presentation (Details Textual)	1 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2015 USD ($) manufacturing_location contract_manufacturer Segment product_line	Dec. 31, 2014 USD ($)	Jul. 03, 2015 USD ($)	Jun. 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	$ 64,200,000
Deferred tax liability recorded associated with unremitted earnings of foreign subsidiary no longer considered indefinitely reinvested	2,100,000	$ 2,100,000	$ 1,600,000
Unremitted earnings of foreign subsidiary	41,700,000		31,800,000
Warranty period, minimum, in years		1 year
Warranty period, maximum, in years		8 years
Accrued warranty liability	920,000	$ 920,000	716,000
Deferred revenue and customer deposits	878,000	878,000	703,000
Cash and cash equivalents	25,031,000	25,031,000	$ 24,732,000		$ 30,748,000	$ 30,647,000
Working capital amount	64,900,000	64,900,000
Debt outstanding	$ 5,900,000	$ 5,900,000
Revolving Credit Facility | East West Bank | Subsequent Event
Description of Business and Basis of Presentation (Textual) [Abstract]
Revolving line of credit				$ 25,000,000
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