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Convertible Notes Payable - Additional Information (Details)
$ / shares in Units, shares in Millions
 1 Months Ended 12 Months Ended 19 Months Ended
Jun. 13, 2016
USD ($)
Jun. 06, 2016
USD ($)
Installment
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2017
Jun. 30, 2016
USD ($)
Debt Instrument [Line Items]              
Conversion of convertible notes       $ 649,000 $ 0    
Senior Secured Convertible Notes [Member]              
Debt Instrument [Line Items]              
Debt instrument, principal face amount $ 35,000,000   $ 34,351,000 34,351,000      
Debt discount on senior notes     21,008,000 $ 21,008,000      
Debt instrument, original issuance date       Jun. 13, 2016      
Debt issuance costs     1,000,000 $ 1,000,000      
Amortization of debt issuance costs       $ 300,000      
Stock issued to holders as payment on convertible notes payable | shares       1.8      
Conversion of convertible notes       $ 600,000      
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 (as defined in the SPA), 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 $ 3,000,000        
Net cash proceeds from notes held in master restricted account as security $ 29,200,000   26,200,000 $ 26,200,000      
Maturity date of notes   Dec. 29, 2017          
Amortization payments number of equal installments | Installment   14          
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       $ 14,000,000      
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 During 2017 [Member]              
Debt Instrument [Line Items]              
Net cash proceeds from notes held in master restricted account as security $ 26,200,000   $ 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       $ 26,200,000      
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 June 13, 2017 and continuing for a period of five years thereafter.      
Warrant exercisable date   Jun. 13, 2017          
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          
Debt discount on senior notes   $ 27,800,000          
Shares issuable upon warrants exercised | shares   6.8