CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	60,787,309	59,293,428
Common stock, shares outstanding	60,787,309	59,293,428
Series A convertible preferred stock
Preferred stock, shares authorized	25,000	25,000
Preferred stock, shares outstanding	0	0