Savings Plan (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Matching contributions to savings plan charged to expense [Abstract]
Company matching contributions	$ 3	$ 2	$ 15	$ 25
Employer match percentage	33.00%	33.00%	33.00%	33.00%