CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED BALANCE SHEETS
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	46,817,829	46,426,714
Common stock, shares outstanding	46,817,829	46,426,714
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001