Annual report pursuant to Section 13 and 15(d)

Contingencies and Commitments Narrative (Details)

v3.3.1.900
Contingencies and Commitments Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
payment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 01, 2015
USD ($)
ft²
Loss Contingencies [Line Items]          
Operating Leases, Future Minimum Payments Due   $ 5,086      
Loss on Contracts $ 1,000        
Number of Remaining Quarterly Lease Payments | payment 6        
Operating Leases, Quarterly Rent Expense $ 71        
Operating Leases, Rent Expense   $ 1,000 $ 700 $ 300  
Minneapolis Headquarters [Member]          
Loss Contingencies [Line Items]          
Area of Real Estate Property | ft²         17,216
Operating Leases, Future Minimum Payments Due         $ 1,822
Leasehold Improvements, Gross         713
Tenant Improvements         $ 689