Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Allowance for Doubtful Accounts Receivable	$ 4,265	$ 3,158
Series A Redeemable Convertible Preferred Stock
Preferred stock par value (in dollars per share)	$ 0.001	$ 0.001
Authorized shares, preferred	10,000,000	10,000,000
Issued shares, preferred	0	0
Outstanding shares, preferred	0	0
Common Stock
Common stock par value (in dollars per share)	$ 0.001	$ 0.001
Authorized shares, common	300,000,000	300,000,000
Issued shares, common	58,434,464	57,084,340
Outstanding shares, common	58,434,464	57,084,340