Description of Business and Summary of Significant Accounting Policies (Textual) (Details)	1 Months Ended	3 Months Ended	12 Months Ended			21 Months Ended
	Apr. 30, 2011 USD ($)	Mar. 31, 2012 USD ($)	Dec. 31, 2012 USD ($) manufacturing_location Segment	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2012 CHF	Sep. 30, 2012 USD ($)	Jun. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Jun. 30, 2011 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2012 Revolving Credit Facility [Member] USD ($)	Dec. 31, 2012 Equipment Term Loan [Member] Secured Debt [Member] USD ($)
Significant Accounting Policies [Line Items]
Manufacturing locations			2
Operating segments			1
Cash and cash equivalents		$ 30,628,000	$ 28,739,000	$ 29,289,000	$ 39,829,000	$ 28,739,000		$ 20,073,000	$ 22,310,000	$ 30,988,000	$ 29,791,000	$ 33,063,000	$ 29,582,000
Credit agreement maximum borrowing														15,000,000
Long-term Debt															3,900,000
Sale of common stock shares	125,000,000		125,000,000
Number of shares sold under sales agreement		572,510				572,510	572,510
Proceeds from issuance of common stock under secondary security offering		10,300,000	10,283,000	0	0
Deferred Revenue, Additions			18,900,000	10,800,000
Deferred revenue recognized			12,700,000	3,200,000
Deferred Revenue, Current		2,568,000	6,408,000	1,042,000		6,408,000		5,149,000	4,170,000
Cost of inventory shipped			9,200,000	5,500,000		9,200,000
Leasehold improvements funded by landlords			5,900,000	3,700,000		5,900,000
Deferred rent related to leasehold improvements funding by landlords			2,700,000	2,100,000		2,700,000
Impairment of property and equipment					880,000
Standard product warranty, term, minimum			1 year
Standard product warranty, term, maximum			2 years
FDIC insurance limit			250,000			250,000
Switzerland non-government financial institutions insured amount							100,000
Advertising expense			1,200,000	287,000	256,000
Shipping and handling expense			$ 1,400,000	$ 2,900,000	$ 1,300,000