Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015	Jul. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001			$ 0.0001
Common stock, shares authorized	500,000,000	500,000,000		100,000,000
Common stock, shares issued	81,983,937	81,311,686	9,531,200
Common stock, shares outstanding	81,983,937	81,311,686