CONSOLIDATED BALANCE SHEETS [Parenthetical] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Redeemable Convertible Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Redeemable Convertible Preferred Stock, shares authorized	1,000,000,000	1,000,000,000
Redeemable Convertible Preferred Stock, shares issued	8,200,000	8,200,000
Redeemable Convertible Preferred Stock, shares outstanding	8,200,000	8,200,000
Redeemable Convertible Preferred Stock, liquidation preference (in dollars)	$ 39,570	$ 39,570
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	200,000,000	200,000,000
Common Stock, shares issued	16,253,427	15,922,321
Common Stock, shares outstanding	18,079,523	17,552,139
Treasury Stock, shares at cost	1,826,096	1,629,818