Annual report pursuant to Section 13 and 15(d)

Balance Sheets (Parenthetical)

v3.19.1
Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
May 07, 2014
Statement Of Financial Position [Abstract]      
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000 5,000,000
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) 125,000,000 125,000,000  
Common stock, shares issued (in shares) 47,971,989 28,971,651  
Common stock, shares outstanding (in shares) 47,971,989 28,971,651