CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (unaudited) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Consolidated Balance Sheets
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	33,621,055	26,423,375
Common stock, shares outstanding	33,621,055	26,423,375