Share-based Compensation Expense (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 67	$ 60	$ 126	$ 111
unrecognized compensation cost related to non-vested stock options, net of forfeitures	681		681
Outstanding, weighted average remaining contractual term (in years)			2 years 10 months 24 days
Options, grants in period, gross	57,500	65,000	57,500	95,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate, average	1.20%	1.20%	1.20%	1.50%
Expected option life, average	6 years 9 months 18 days	7 years 0 months 3 days	6 years 9 months 18 days	7 years 1 month 10 days
Expected price volatility, average	50.10%	51.70%	50.10%	51.60%
Weighted average per share fair value	$ 4.49	$ 2.07	$ 4.49	$ 2.23
Cost of Goods, Total [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	2	2	4	1
Selling and Marketing Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	19	16	34	30
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	13	10	24	17
General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 33	$ 32	$ 64	$ 63