CONDENSED BALANCE SHEETS (Parenthetical) - $ / shares shares in Thousands	Sep. 30, 2017	Dec. 31, 2016
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000	5,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	280,000	280,000
Common stock, shares issued	149,680	149,065
Common stock, shares outstanding	149,680	149,065
Series A Preferred Stock
Preferred stock, shares designated	1,500	1,500
Preferred stock, shares issued	1	1
Preferred stock, shares outstanding	1	1