Income Taxes (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended
	Jan. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Line Items]
(Benefit) provision for income tax		$ (3,348,000)	$ 670,000	$ 2,176,000
Undistributed Earnings of Foreign Subsidiaries		45,000,000
Deferred tax assets, change in valuation allowance		7,700,000	4,900,000	700,000
Net operating loss carryforwards		87,400,000
Research and development credit carryforwards gross amount		11,700,000
State net operating loss carryforwards		18,900,000
State research and development tax credit carryforwards		2,100,000
Net operating loss carryforwards related to stock option deductions		4,200,000
Unrecognized Tax Benefits		6,053,000	5,715,000	4,225,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		2,500,000
Unrecognized tax benefits, amount offset by valuation allowance		3,600,000
Expected increase in gross deferred tax assets in first quarter of 2013	$ 300,000
China [Member]
Income Tax Disclosure [Line Items]
Statutory income tax rate		25.00%		22.00%
Income tax rate 1			24.00%
Income tax rate 2			25.00%