Quarterly report pursuant to Section 13 or 15(d)

Offerings of Common Stock and Warrants and At-the-Market Offering Program (Details)

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Offerings of Common Stock and Warrants and At-the-Market Offering Program (Details) - USD ($)
 3 Months Ended 36 Months Ended
Apr. 13, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 07, 2018
Mar. 31, 2018
Aug. 28, 2015
Common stock sold (in shares) 3,806,243            
Common stock, par value (in dollars per share)   $ 0.001   $ 0.001   $ 0.001  
Net proceeds from offering of common stock and warrants   $ 4,973,000 $ 2,520,000        
June 2018 Sales Agreement              
Aggregate offering price for at-the-market offering program   $ 24,000,000   $ 24,000,000      
Common stock sold (in shares)   700,000          
Net proceeds from sale of the common stock, after deducting fees and other offering expenses (in dollars)   $ 1,000,000          
Common stock commissions paid   $ 32,600          
August 2015 Sales Agreement              
Common stock sold (in shares)   2,800,000   26,000,000      
Net proceeds from sale of the common stock, after deducting fees and other offering expenses (in dollars)   $ 4,000,000   $ 28,600,000      
Common stock commissions paid   $ 100,000   $ 800,000      
Maximum | June 2018 Sales Agreement              
Aggregate offering price for at-the-market offering program         $ 25,000,000    
Maximum | August 2015 Sales Agreement              
Aggregate offering price for at-the-market offering program             $ 30,000,000
Series A Warrants              
Warrants exercised (in shares) 5,760,000            
Exercise price (in dollars per share) $ 0.60            
Outstanding warrants (in shares)   2,718,750   2,718,750