CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2017	Dec. 31, 2016
CONSOLIDATED BALANCE SHEETS
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	650,000,000	650,000,000
Common stock, shares issued	111,167,877	110,611,287
Common stock, shares outstanding	111,167,877	110,611,287