Commitments and Contingencies (Annual Future Minimum Payments Under Operating Leases) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity, Net [Abstract]
2017	$ 1,040
2018	36
Total minimum lease payments	1,076
Future Minimum Sublease Income Transactions, Fiscal Year Maturity [Abstract]
2017	(74)
2018	(19)
Total minimum lease payments	(93)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017	966
2018	17
Total minimum payments	$ 983