Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Net of allowance for doubtful accounts	$ 580	$ 276
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	35,700,000	35,700,000
Common stock, shares issued	13,194,806	12,563,095
Common stock, shares outstanding	13,194,806	12,563,095
Treasury Stock, shares	401,626	401,626
Series A Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, par value	$ 0.01	$ 0.01
Redeemable convertible preferred stock, authorized	6,303,033	6,303,033
Redeemable convertible preferred stock, issued	6,303,033	6,303,033
Redeemable convertible preferred stock, outstanding	6,303,033	6,303,033
Redeemable convertible preferred stock, liquidation value	$ 9,505	$ 9,252
Series B Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, par value	$ 0.01	$ 0.01
Redeemable convertible preferred stock, authorized	519,269	519,269
Redeemable convertible preferred stock, issued	519,269	519,269
Redeemable convertible preferred stock, outstanding	519,269	519,269
Redeemable convertible preferred stock, liquidation value	$ 904	$ 880
Series C Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, par value	$ 0.01	$ 0.01
Redeemable convertible preferred stock, authorized	6,873,797	6,873,797
Redeemable convertible preferred stock, issued	6,873,797	6,873,797
Redeemable convertible preferred stock, outstanding	6,873,797	6,873,797
Redeemable convertible preferred stock, liquidation value	$ 61,581	$ 59,829
Series D Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, par value	$ 0.01	$ 0.01
Redeemable convertible preferred stock, authorized	2,696,504	2,696,504
Redeemable convertible preferred stock, issued	2,686,516	2,686,516
Redeemable convertible preferred stock, outstanding	2,686,516	2,686,516
Redeemable convertible preferred stock, liquidation value	$ 31,992	$ 31,143
Pro Forma [Member]
Common stock, shares authorized	100,000,000
Common stock, shares issued	39,247,411
Common stock, shares outstanding	39,247,411
Treasury Stock, shares	401,626
Pro Forma [Member] | Series A Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, authorized	0
Redeemable convertible preferred stock, issued	0
Redeemable convertible preferred stock, outstanding	0
Pro Forma [Member] | Series B Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, authorized	0
Redeemable convertible preferred stock, issued	0
Redeemable convertible preferred stock, outstanding	0
Pro Forma [Member] | Series C Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, authorized	0
Redeemable convertible preferred stock, issued	0
Redeemable convertible preferred stock, outstanding	0
Pro Forma [Member] | Series D Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, authorized	0
Redeemable convertible preferred stock, issued	0
Redeemable convertible preferred stock, outstanding	0