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Stockholders' Equity - Equity Issuances (Details) - USD ($)
 1 Months Ended 6 Months Ended
Mar. 31, 2019
Feb. 28, 2018
Jun. 30, 2019
Aug. 31, 2018
Lincoln Park Agreement [Member]        
Class of Stock [Line Items]        
Aggregate offering amount authorized per agreement $ 26,000,000      
Commitment shares issued as consideration per agreement (in shares) 181,510      
Number of shares sold (in shares) 250,000      
Price of shares sold (in dollars per share) $ 4.00      
Gross price for stock transaction $ 1,000,000      
Term of agreement (in months) 36 months      
Number of shares allowable to direct for Regular Purchase (in shares) 100,000      
Maximum obligation per directed purchase transaction for Regular Purchase $ 2,500,000      
Maximum shares allowed in Accelerated Purchase as percent of shares In Regular Purchase (percent) 300.00%      
Maximum shares allowed in Accelerated Purchase as percent of shares traded during specified period (percent) 30.00%      
Maximum beneficial ownership allowable per agreement (percent) 9.99%      
H.C. Wainwright Sales Agreement [Member]        
Class of Stock [Line Items]        
Aggregate offering amount authorized per agreement   $ 12,000,000    
Maximum number of shares authorized per agreement (in shares)   2,790,697   4,921,260
Commission on gross proceeds due to third party (percent)   3.00%    
Stock issued (shares)     149,041  
Proceeds from issuance of stock     $ 1,000,000  
H.C. Wainwright Sales Amended Agreement [Member]        
Class of Stock [Line Items]        
Aggregate offering amount authorized per agreement       $ 25,000,000