CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Allowance for doubtful accounts	$ 361	$ 282
Redeemable convertible preferred stock, par value	$ 0.01	$ 0.01
Redeemable convertible preferred stock, shares authorized	0	24.0
Redeemable convertible preferred stock, shares issued	0	23.6
Redeemable convertible preferred stock, shares outstanding	0	23.6
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5.0	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	400.0	125.0
Common stock, shares issued	72.8	23.7
Common stock, shares outstanding	72.3	23.2
Common stock shares outstanding, subject to repurchase	0.8	0.8
Treasury stock, shares	0.5	0.5