CONDENSED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Stockholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	833,334	833,334
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)	41,666,667	41,666,667
Common stock, shares issued (in shares)	28,037,501	28,037,501
Common stock, shares outstanding (in shares)	28,037,501	28,037,501
Series A Junior Participating Preferred Stock [Member]
Stockholders' equity:
Preferred stock, shares authorized (in shares)	4,167	4,167
Series B Convertible Preferred Shares [Member]
Stockholders' equity:
Preferred stock, stated value	$ 1,000	$ 1,000
Preferred stock, shares authorized (in shares)	650	650
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0