Income Taxes Narrative (Details)	Dec. 31, 2015 USD ($)
Income Taxes (Textual) [Abstract]
Uncertain Income Tax Percentage Of Likelihood	0.5
Unrecognized Tax Benefits	$ 0
Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Income tax net operating loss carryforwards	391,216,000
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Income Tax Disclosure [Line Items]
California research and development tax credit carryforwards	17,571,000
State and Local Jurisdiction [Member]
Income Tax Disclosure [Line Items]
Income tax net operating loss carryforwards	298,078,000
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]
Income Tax Disclosure [Line Items]
California research and development tax credit carryforwards	$ 10,765,000