Commitments - Lease table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating leases
2017	$ 288
2018	188
Minimum annual lease payments	476
Operating Leases, Rent Expense	$ 200	$ 200	$ 200