CONDENSED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Stockholders' equity
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized (in shares)	5,000,000	5,000,000
Series A Junior Participating Preferred Stock, shares authorized (in shares)	25,000	25,000
Preferred Stock, shares issued (in shares)	0	0
Preferred Stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	55,920,319	42,116,964
Common stock, shares outstanding (in shares)	55,920,319	42,116,964
Treasury stock (in shares)	143,796	143,796