CONSOLIDATED BALANCE SHEETS - (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Accounts receivable, allowance for doubtful accounts	$ 636	$ 582
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	99,000,000	99,000,000
Common stock, shares issued (in shares)	2,742,857	2,742,857
Common stock, shares outstanding (in shares)	2,402,612	2,702,940
Treasury stock, shares (in shares)	340,245	39,917