Allowance for Doubtful Accounts - Summary of Activity in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Receivables [Abstract]
Balance at beginning of period	$ 245	$ 400	$ 408	$ 332
Bad debt expense (credit)	81	59	46	138
Recoveries (write-offs), net	(24)	(44)	(152)	(55)
Balance at end of period	$ 302	$ 415	$ 302	$ 415