Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, authorized shares	900,000,000	900,000,000
Common stock, issued shares	84,048,081	97,589,598
Common stock, outstanding shares	84,048,081	97,589,598
Series A Preferred Stock
Preferred stock, par value (in usd per share)	$ 0.001	$ 0
Preferred stock, shares authorized	36,000,000	0
Preferred stock, shares issued	61,435	0
Preferred stock, shares outstanding	61,435	0
Preferred stock, liquidation preference per share (in usd per share)	$ 25.00	$ 0