Commitments and Contingencies (Narrative) (Details)				1 Months Ended			3 Months Ended		12 Months Ended
	Jan. 06, 2017 USD ($)	Oct. 01, 2014	Sep. 23, 2014 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2012 USD ($)	Dec. 31, 2016 USD ($) building	Dec. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)	Nov. 30, 2014 building
Loss Contingencies [Line Items]
Rent expense							$ 300,000	$ 300,000
Fair value assumptions, credit adjusted risk-free rate, range minimal amount							1.20%
Fair value assumptions, credit adjusted risk-free rate, range maximum amount							4.20%
Accretion expense							$ 17,000	15,000
Payments to terminate lease agreement								200,000
Reduction in ARO								$ 300,000
Business combination, indemnification assets, range of outcomes, value						$ 3,400,000.0
Business combination, indemnification duration, period taken into account for						2 years
Sumitomo Electric Industries, LTD [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought			$ 47,500,000
Gain on settlement									$ 3,400,000
Discontinued Operations, Disposed of by Sale [Member]
Loss Contingencies [Line Items]
Payments to terminate lease agreement					$ 200,000
Discontinued Operations, Disposed of by Sale [Member] | Sumitomo Electric Industries, LTD [Member]
Loss Contingencies [Line Items]
Gain on settlement									3,800,000
Write off of loss accrual									400,000
Settled Litigation [Member] | Sumitomo Electric Industries, LTD [Member]
Loss Contingencies [Line Items]
Loss contingency, proceeds				$ 1,900,000
Litigation settlement, amount									$ 2,600,000
Settled Litigation [Member] | Mirasol Class Action [Member]
Loss Contingencies [Line Items]
Provision accrual							$ 200,000
Settled Litigation [Member] | Mirasol Class Action [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount	$ 300,000
Settled Litigation [Member] | Mirasol Wrongful Termination [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount	$ 50,000
Buildings [Member] | Property Subject to Operating Lease [Member]
Loss Contingencies [Line Items]
Number of leased buildings | building							6
Leases retroactively effective | building										4
Lease term		3 years
Operating lease, term extension, option to extend		3 years