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Stockholders' Equity - February 2018 Financing - Additional Information (Details)
$ / shares in Units, $ in Millions
 1 Months Ended
Feb. 28, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
$ / shares
shares
Stockholders Equity Note [Line Items]    
Sale of common stock, net of expenses (in shares) 424,000  
Number of pre-funded warrants 76,000  
Net proceeds from issuance of private placement | $ $ 4.3  
February 2018 Warrants [Member]    
Stockholders Equity Note [Line Items]    
Warrants issued to purchase Common Stock 1,000,000  
Value of warrants issued | $ $ 18.3  
Warrants exercisable per share price (in dollars per share) | $ / shares   $ 10.00
Number of warrants outstanding (in shares)   1,000,000
February 2018 Warrants [Member] | Exercise Price [Member]    
Stockholders Equity Note [Line Items]    
Warrants measurement input | $ / shares 10.00  
February 2018 Warrants [Member] | Contractual Term [Member]    
Stockholders Equity Note [Line Items]    
Warrants term 6 years  
February 2018 Warrants [Member] | Volatility [Member]    
Stockholders Equity Note [Line Items]    
Warrants measurement input 1.2268  
February 2018 Warrants [Member] | Risk Free Rate [Member]    
Stockholders Equity Note [Line Items]    
Warrants measurement input 0.01