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Stockholders' Equity - 2018 Equity Financing - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 22, 2018
Mar. 28, 2018
Sep. 30, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 25, 2018
Jun. 21, 2018
Jun. 27, 2017
Class of Stock [Line Items]                          
Fair value of derivative liability         $ 19,780,000   $ 0 $ 19,780,000 $ 0        
Change in fair value of derivative liability             $ (18,886,000) $ (26,278,000) $ 0 $ 0      
Common Stock Purchase Price Description   The purchase price for each share of Common Stock issuable in the Second Tranche Transaction was defined as the lower of (a) $1.265 (which was a 15% premium to the First Tranche Purchase Price) and (b) a 20% discount to the volume weighted average price ("VWAP") of the shares of Common Stock on the Nasdaq Stock Market for the 20 trading days immediately prior to the closing of the Second Tranche Transaction; provided, however, that the purchase price could not be lower than $0.88, which was a 20% discount to the First Tranche Purchase Price.                      
Common Stock, Shares Authorized 150,000,000       150,000,000   150,000,000 150,000,000 120,000,000     120,000,000 60,000,000
Exercise price of warrants         $ 1.23   $ 1.23 $ 1.23 $ 2.50 $ 2.50      
Proceeds from issuance of stock, net of issuance costs             $ 0 $ 41,515,000 $ 8,404,000 $ 16,500,000      
Second Tranche Transaction [Member]                          
Class of Stock [Line Items]                          
Change in fair value of derivative liability       $ (18,900,000) $ (24,000,000) $ (2,300,000)              
Second Tranche Warrants [Member]                          
Class of Stock [Line Items]                          
Gross proceeds from exercise of warrants     $ 28,900,000                    
Exercise price of warrants     $ 1.43 $ 1.43                  
Warrant purchase price description               The exercise price of each Second Tranche Warrant issued in the Second Tranche Transaction is an amount equal to the lower of (a) $1.43 (a 30% premium to the First Tranche Purchase Price) and (b) a 20% discount to the VWAP of the shares of Common Stock on the Nasdaq Stock Market for the 20 trading days immediately prior to the exercise of a Second Tranche Warrant; provided, however, that the exercise price cannot be lower than $0.88, which is a 20% discount to the First Tranche Purchase Price.          
Second Tranche Warrants [Member] | Maximum [Member]                          
Class of Stock [Line Items]                          
Percentage of premium to first tranche share purchase price   30.00%                      
Second Tranche Warrants [Member] | Minimum [Member]                          
Class of Stock [Line Items]                          
Percentage discount to volume weighted average price for 20 days immediately preceding the closing of the Second Tranche Transaction   20.00%                      
Exercise price of warrants   $ 0.88                      
Percentage of discount to the First Tranche Purchase Price   20.00%                      
First Tranche Securities Purchase Agreement [Member]                          
Class of Stock [Line Items]                          
Common stock issued to investors   8,606,324                      
Common stock price per share   $ 1.10                      
Gross proceeds from issuance of common stock   $ 9,500,000                      
Portion of First Tranche net proceeds allocated to equity   4,600,000                      
Proceeds from issuance of stock, net of issuance costs   $ 9,500,000                      
Second Securities Purchase Agreement [Member]                          
Class of Stock [Line Items]                          
Gross proceeds to be received from issuance of common shares, subject to stockholder approval $ 25,500,000                        
2018 Equity Financing [Member]                          
Class of Stock [Line Items]                          
Common Stock, Shares Authorized 150,000,000                     120,000,000  
Share issuance costs           343,000              
2018 Equity Financing [Member] | Second Tranche Transaction [Member]                          
Class of Stock [Line Items]                          
Units issued to investors, with each Unit consisting of one common share and one warrant to purchase one common share 20,184,224                        
Reclassification of the derivative liability balance to equity upon the exercise of the Second Tranche Transaction Warrants               $ 29,100,000          
Fair value of derivative liability           6,900,000              
Change in fair value of derivative liability           $ 2,200,000   22,200,000          
Percentage discount to volume weighted average price for 20 days immediately preceding the closing of the Second Tranche Transaction   20.00%                      
Unit price per share $ 1.265                        
Gross proceeds from issuance of units $ 25,500,000                        
2018 Equity Financing [Member] | Second Tranche Transaction [Member] | Maximum [Member]                          
Class of Stock [Line Items]                          
Common stock price per share   $ 1.265                      
Percentage of premium to first tranche share purchase price   15.00%                      
2018 Equity Financing [Member] | Second Tranche Transaction [Member] | Minimum [Member]                          
Class of Stock [Line Items]                          
Common stock price per share   $ 0.88                      
Percentage of premium to first tranche share purchase price   20.00%                      
2018 Equity Financing [Member] | Second Tranche Warrants [Member]                          
Class of Stock [Line Items]                          
Reclassification of the derivative liability balance to equity upon the exercise of the Second Tranche Transaction Warrants             38,700,000            
Change in fair value of derivative liability         1,600,000   $ 18,900,000            
Derivative liability         $ 19,800,000     $ 19,800,000     $ 18,200,000    
Exercise price of warrants             $ 1.43