Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 0	$ 0	$ 0
State	0	0	0
Foreign	41	41	29
Total	41	41	29
Deferred:
Federal	0	0	0
State	0	0	0
Foreign	0	0	0
Total	$ 41	$ 41	$ 29
Tax at U.S. statutory rate	(34.00%)	(34.00%)	(34.00%)
State taxes, net of federal benefits	(2.27%)	(2.36%)	(2.32%)
Tax credit	(0.85%)	(8.59%)	(0.05%)
Change in valuation allowance	31.07%	37.49%	31.24%
Rate change	0.01%	(0.02%)	0.17%
Other	6.11%	7.58%	5.03%
Effective income tax rate	0.07%	0.10%	0.07%