Accounts Receivable (Allowance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts:
Balance, beginning of period	$ 171	$ 193	$ 52
Provisions for losses on accounts receivables, net of adjustments	(48)	0	141
Accounts receivable written off, net of recoveries	(8)	(22)	0
Balance, end of period	$ 115	$ 171	$ 193