CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
CONSOLIDATED BALANCE SHEETS
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	46,942,735	46,817,829
Common stock, shares outstanding	46,942,735	46,817,829
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001