Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Treasury stock
Treasury stock, shares	22,602	22,602
Class A common stock
Common stock
Common Stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common Stock, shares issued	30,573,509	12,672,260
Common Stock, shares outstanding	30,550,907	12,649,658
Class B common stock
Common stock
Common Stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common Stock, shares issued	31,273,130	36,719,499
Common Stock, shares outstanding	31,273,130	36,719,499