Commitments and Contingencies (Narrative) (Details) $ in Thousands	1 Months Ended		9 Months Ended	12 Months Ended
	Feb. 28, 2015 ft²	Jan. 31, 2015 ft²	Sep. 30, 2015 ft²	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Property Subject to or Available for Operating Lease [Line Items]
Total lease payments through the end of the lease				$ 161
Operating Leases, Rent Expense				699	$ 176	$ 84
Office Space | ft²			3,713
Approximate total lease payments				1,230
Twenty-five Month Sublease Agreement, Expiring March 31, 2017 [Member]
Property Subject to or Available for Operating Lease [Line Items]
Lease agreement period		25 months
Area of space, in sqft | ft²		4,047
Total lease payments through the end of the lease				57
Thirty-two Month Sublease Agreement, Expiring October 31, 2017 [Member]
Property Subject to or Available for Operating Lease [Line Items]
Lease agreement period	32 months
Area of space, in sqft | ft²	18,599
Total lease payments through the end of the lease				1,017
Other office space [Member]
Property Subject to or Available for Operating Lease [Line Items]
Approximate total lease payments				$ 300