Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts receivable	$ 12,055	$ 9,701
Allowance for doubtful accounts	2,074	2,589
Total	9,981	7,112
(Benefit) provision for bad debts	(18)	1,070	$ 847
Write-offs of accounts receivable	1,100	200	1,100
Recoveries of accounts receivable previously written	$ 200	$ 200
Maximum
Recoveries of accounts receivable previously written			$ 100