- Income Taxes (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Income Taxes
Minimum cumulative change in ownership that could result in a Section 382 ownership change (as a percent)	50.00%
Federal income tax purpose
Income Taxes
Net operating loss carryforward	$ 10.1
California franchise tax purpose
Income Taxes
Net operating loss carryforward	$ 7.2