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Convertible Notes Payable - Additional Information (Details)
$ / shares in Units, shares in Millions
 3 Months Ended 6 Months Ended 19 Months Ended
Jun. 13, 2016
USD ($)
Jun. 06, 2016
USD ($)
Installment
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
Dec. 31, 2017
Debt Instrument [Line Items]            
Debt discount amortization       $ 1,568,000 $ 0  
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     33,432,000 33,432,000    
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 $ 35,000,000    
Interest rate upon default     0.00% 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     $ 1,600,000      
Beneficial conversion feature       $ 4,400,000    
Debt instrument, put options issued on default and change in control, value     $ 0 $ 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 $ 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 $ 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