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Stockholders' Equity - February 2018 Financing - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended
Feb. 28, 2018
Mar. 31, 2018
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)   $ 10.00
Number of warrants outstanding (in shares)   1,000,000
Valuation using exercise price $ 10.00  
Valuation using contractual term 6 years  
Valuation using volatility rate 122.68%  
Valuation using risk free rate 1.00%