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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 |  |  |  |  |

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