Description of Business and Summary of Significant Accounting Policies (Textual) (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) manufacturing_location contract_manufacturer Segment product_line	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 CHF (SFr)	Dec. 31, 2015 USD ($)	Dec. 31, 2012 USD ($)
Significant Accounting Policies [Line Items]
Restricted cash		$ 0			$ 400,000
Manufacturing locations | manufacturing_location	3
Cash and cash equivalents		24,732,000	$ 30,647,000		24,382,000	$ 28,739,000
Consigned finished goods		184,000			28,000
Total deferred revenue and customer deposits		703,000			3,066,000
Leasehold improvements funded by landlords		2,500,000			2,200,000
Deferred rent related to leasehold improvements funding by landlords		2,700,000			2,200,000
Standard product warranty, term, minimum	1 year
Standard product warranty, term, maximum	8 years
Accrued warranty		716,000			1,288,000
FDIC insurance limit					$ 250,000
Switzerland non-government financial institutions insured amount | SFr				SFr 100,000
Research and development expense	$ 24,697,000	26,320,000	22,542,000
Third party funding offset	1,300,000	1,000,000	1,300,000
Advertising expense	1,100,000	1,400,000	884,000
Shipping and handling expense	$ 1,000,000	$ 1,500,000	$ 1,300,000
Number of operating segments | Segment	1
High Reliability [Member]
Significant Accounting Policies [Line Items]
Number of product lines | product_line	3
China [Member]
Significant Accounting Policies [Line Items]
Number of contract manufacturers | contract_manufacturer	2
Minimum
Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment	3 years
Maximum
Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment	10 years
Shenzhen Xinlikang [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	33.00%