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Convertible Notes Payable - Additional Information (Details)
$ / shares in Units, shares in Millions
 9 Months Ended 19 Months Ended
Jun. 13, 2016
USD ($)
Jun. 06, 2016
USD ($)
Installment
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
Dec. 31, 2017
Jun. 30, 2016
USD ($)
Senior Secured Convertible Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, principal face amount     $ 35,000,000   $ 35,000,000
Debt discount on senior notes     28,587,000    
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member]          
Debt Instrument [Line Items]          
Debt instrument, principal face amount $ 35,000,000 $ 35,000,000      
Debt discount on senior notes   $ 2,800,000 $ 35,000,000    
Interest rate upon default     0.00%    
Rate of interest in event of default   15.00%      
Debt instrument interest rate computation terms     The Notes do not bear any ordinary interest. However, interest shall commence accruing immediately upon the occurrence of, and shall continue accruing during the continuance of, an Event of Default, at 15% per annum and shall be computed on the basis of a 360-day year of twelve 30-day months and shall be payable    
Proceeds from issuance of notes available for general corporate purposes 3,000,000 $ 3,000,000      
Net cash proceeds from notes held in master restricted account as security $ 29,200,000 $ 29,200,000      
Maturity date of notes   Dec. 29, 2017      
Amortization payments number of equal installments | Installment   12      
Period after original date of issuance of notes for which amortization payment begins 7 months        
Debt instrument, original issuance date     Jun. 13, 2016    
Debt instrument, conversion price | $ / shares   $ 4.39      
Debt discount amortization     $ 10,100,000    
Beneficial conversion feature     4,400,000    
Debt instrument, put options issued on default and change in control, value     $ 0    
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member] | Unrestricted On 20th Trading Day After Stockholder Approval [Member]          
Debt Instrument [Line Items]          
Net cash proceeds from notes held in master restricted account as security $ 3,000,000 $ 3,000,000      
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member] | Unrestricted After Starting 30th Trading Day After Trigger Date [Member]          
Debt Instrument [Line Items]          
Net cash proceeds from notes held in master restricted account as security 26,200,000 26,200,000      
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member] | Restricted Cash [Member]          
Debt Instrument [Line Items]          
Proceeds from issuance of notes and warrants   $ 29,200,000      
Series C Warrants [Member]          
Debt Instrument [Line Items]          
Warrants exercise price per share | $ / shares     $ 4.83    
Series C Warrants [Member] | Securities Purchase Agreement [Member]          
Debt Instrument [Line Items]          
Additional issuance of common stock purchase price per share. | $ / shares   $ 0.01      
Shares issuable upon warrants exercised description     On December 31, 2017, the number of Warrant Shares issuable upon exercise of the Series C Warrants will be increased by such number of Warrant Shares equal to 75% of the difference of (i) the quotient of (A) the product of (x) the exercise price as of the date of issuance (as adjusted for certain events) multiplied by (y) the number of Warrant Shares as of the date of issuance (as adjusted for certain events), divided by (B) the volume-weighted average price of the Common Stock on the maturity date, less (ii) the number of Warrant Shares as of the date of issuance (as adjusted for certain events).    
Warrants exercise price per share | $ / shares   $ 4.83      
Warrant exercisable term description     Each Series C Warrant will be exercisable by the holder beginning one year after the closing date and continuing for a period of five years thereafter.    
Vesting period to exercise warrants   1 year      
warrant exercisable period after vesting   5 years      
Series C Warrants [Member] | Securities Purchase Agreement [Member] | Scenario, Forecast [Member]          
Debt Instrument [Line Items]          
Conditional percentage of increase in number of shares issuable upon exercise of warrants       75.00%  
Series C Warrants [Member] | Senior Secured Convertible Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, principal face amount         $ 35,000,000
Series C Warrants [Member] | Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member]          
Debt Instrument [Line Items]          
Proceeds from issuance of notes and warrants $ 32,200,000 $ 32,200,000      
Shares issuable upon warrants exercised | shares   6.8