CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS
Accounts and other receivables, allowance for doubtful accounts and commission adjustments	$ 4,546	$ 4,872
PROPERTY AND EQUIPMENT, accumulated depreciation	$ 5,297	$ 4,980
STOCKHOLDERS' 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)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	175,908,637	175,741,970
Common stock, shares outstanding (in shares)	165,600,550	165,433,883
Treasury stock, at cost (in shares)	10,308,087	10,308,087