Income Taxes (Details 3)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of difference between the federal statutory tax rate and the effective tax rate
Federal statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	2.40%	3.10%	3.60%
Foreign income tax	(7.90%)	(0.90%)	(1.90%)
Research and development tax credits	1.00%	(0.30%)	0.20%
Original issue discount	0.00%	0.00%	0.10%
Non-Deductible components of convertible debt	(16.70%)	0.00%	0.00%
Other items including valuation allowance adjustments and permanent items	(11.40%)	(11.40%)	35.90%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(3.90%)	(0.70%)	2.00%
Total	(1.50%)	24.80%	74.90%