CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
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	110,611,287	109,298,393
Common stock, shares outstanding	110,611,287	109,298,393