Income Taxes (Details 2) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Tax credit carryforwards
Undistributed earnings of foreign subsidiaries	$ 700,000
Reconciliation of income taxes provided at the federal statutory rate (35%) to actual income tax provision (benefit)
Federal statutory rate	35.00%
Income tax benefit computed at U.S. statutory rate	(8,653,000)	(9,626,000)	4,040,000
Federal alternative minimum tax			247,000
State income tax (net of federal benefit)	2,000	2,000	2,000
Foreign income tax at rate different from U.S. statutory rate	(11,000)	(13,000)	(9,000)
Research and development credits	(1,196,000)	(691,000)	(1,254,000)
Foreign tax credit			(17,000)
Stock-based compensation	91,000	252,000	292,000
Amortization of intangible assets	(100,000)	(100,000)	(657,000)
Valuation allowance changes affecting tax provision	9,915,000	10,526,000	(2,363,000)
Other	23,000	(240,000)	7,000
Total	71,000	110,000	288,000
Domestic and foreign components of income (loss) before income tax provision (benefit)
U.S.	(24,906,000)	(27,737,000)	11,363,000
Non-U.S.	183,000	233,000	181,000
Income (loss) before income taxes	(24,723,000)	(27,504,000)	11,544,000
Federal
Tax credit carryforwards
Foreign tax credit carryforward that begin to expire in 2014	1,100,000
Research and development \| Federal
Tax credit carryforwards
Tax credit carryforwards with expiration	6,300,000
Research and development \| California
Tax credit carryforwards
Tax credit carryforwards without expiration	$ 5,200,000

Represents the portion of the difference, between total income tax expense or benefit as reported in the income statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to federal alternative minimum tax income tax expense or benefit.

No definition available.