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Secured Convertible Notes and Related Common Stock Purchase Warrants - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 06, 2018 | Sep. 30, 2018 | Aug. 31, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  | $ 9,400,000 |  |  |  | $ 9,400,000 |  | $ 9,400,000 |  |
Debt discount on senior notes |  | 6,600,000 |  |  |  | 6,600,000 |  | 6,600,000 |  |
Notes payable maturity amount |  | $ 2,800,000 |  |  |  | $ 2,800,000 |  | $ 2,800,000 |  |
Exercise price of warrants |  | $ 2.85 |  |  |  | $ 2.85 |  | $ 2.85 |  | $ 13,942.79
Loss on issuance of financial instrument |  |  |  |  |  | $ 0 | $ 0 | $ 2,826,000 | $ 0 |
Fair value of warrants being reclassified from liability to equity |  |  |  |  |  | 4,210,000 |  |  |  |
Loss on debt extinguishment |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ (9,613,000) |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of outstanding notes | $ 4,900,000 |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price of warrants |  | 19,712,000 |  |  |  | $ 19,712,000 |  | $ 19,712,000 |  | 19,712,000
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price of warrants |  | $ 0.01 |  |  |  | $ 0.01 |  | $ 0.01 |  | $ 1,225
Third Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price of warrants |  |  | $ 1.75 |  |  |  |  |  |  |
June 2018 Series D Warrants [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt discount on senior notes |  |  |  |  | $ 2,300,000 |  |  |  |  |
Shares issuable upon warrants exercised |  |  |  |  | 1.1 |  |  |  |  |
Exercise price of warrants |  |  |  |  | $ 4.00 |  |  |  |  |
Loss on issuance of financial instrument |  |  |  |  | $ 2,800,000 |  |  |  |  |
Warrants term |  |  |  |  | 5 years |  |  |  |  |
June 2018 Pre-Funded Series D Warrants [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issuable upon warrants exercised |  |  | 22.2 |  |  |  |  |  |  |
Warrants exercisable period |  |  |  | Jul. 20, 2018 |  |  |  |  |  |
Fair value of warrants being reclassified from liability to equity |  |  |  | $ 4,200,000 |  |  |  |  |  |
June 2018 Pre-Funded Series D Warrants [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issuable upon warrants exercised |  |  |  |  | 13.0 |  |  |  |  |
Exercise price of warrants |  |  |  |  | $ 0.01 |  |  |  |  |
Buy back of warrants, description |  |  |  |  |  |  |  | The Company was initially able to buy back each June 2018 Pre-Funded Series D Warrant on its date of initial exercisability so long as the Company was not in default and the applicable installment payment for each month had been paid when due. |  |
Warrants term |  |  |  |  | 5 years |  |  |  |  |
Warrants exercisable, description |  |  |  |  |  |  |  | June 2018 Pre-Funded Series D Warrants have a five-year term from initial exercisability which was to begin on the fifth day of each month commencing December 5, 2018, through December 5, 2019, for each of Warrant D-1-201 through 213 respectively. |  |
Warrants exercisable, start date |  |  |  |  | Dec. 05, 2018 |  |  |  |  |
Warrants exercisable, end date |  |  |  |  | Dec. 05, 2019 |  |  |  |  |
July 2018 Pre-Funded Series D Warrants [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issuable upon warrants exercised |  |  | 15.8 |  |  |  |  |  |  |
July 2018 Pre-Funded Series D Warrants [Member] | Second Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issuable upon warrants exercised |  |  |  | 9.2 |  |  |  |  |  |
Exercise price of warrants |  |  |  | $ 0.01 |  |  |  |  |  |
July 2018 Series D Warrant [Member] | Second Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt discount on senior notes |  |  |  | $ 1,400,000 |  |  |  |  |  |
Shares issuable upon warrants exercised |  |  |  | 0.8 |  |  |  |  |  |
Exercise price of warrants |  |  |  | $ 4.00 |  |  |  |  |  |
Debt financing costs |  |  |  | $ 200,000 |  |  |  |  |  |
August 2018 Pre-Funded Series D Warrants [Member] | Third Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issuable upon warrants exercised |  |  | 23.8 |  |  |  |  |  |  |
Exercise price of warrants |  |  | $ 0.01 |  |  |  |  |  |  |
August 2018 Series D Warrant [Member] | Third Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt discount on senior notes |  |  | $ 2,100,000 |  |  |  |  |  |  |
Shares issuable upon warrants exercised |  |  | 2.0 |  |  |  |  |  |  |
Exercise price of warrants |  |  | $ 1.75 |  |  |  |  |  |  |
Debt financing costs |  |  | $ 100,000 |  |  |  |  |  |  |
June Two Thousand Eighteen and July Two Thousand Eighteen Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, conversion price |  |  | $ 1.75 |  |  |  |  |  |  |
Percentage of subsequent financings used to repayment of notes payable |  |  | 50.00% |  |  |  |  |  |  |
Minimum percentage of change in cash flows |  |  | 10.00% |  |  |  |  |  |  |
Loss on debt extinguishment |  |  | $ 1,100,000 |  |  |  |  |  |  |
July 2018 Pre-Funded Series D Warrants [Member] | Fourth Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issuable upon warrants exercised |  | 3.1 |  |  |  | 3.1 |  | 3.1 |  |
Exercise price of warrants |  | $ 0.01 |  |  |  | $ 0.01 |  | $ 0.01 |  |
September 2018 Series D Warrant [Member] | Fourth Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt discount on senior notes |  | $ 400,000 |  |  |  | $ 400,000 |  | $ 400,000 |  |
Shares issuable upon warrants exercised |  | 0.3 |  |  |  | 0.3 |  | 0.3 |  |
Exercise price of warrants |  | $ 1.75 |  |  |  | $ 1.75 |  | $ 1.75 |  |
June 2018 Convertible Note [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  | $ 3,400,000 |  |  |  | $ 3,400,000 |  | $ 3,400,000 |  |
Debt discount on senior notes |  | $ 1,500,000 |  |  |  | $ 1,500,000 |  | $ 1,500,000 |  |
Interest rate |  | 8.00% |  |  |  | 8.00% |  | 8.00% |  |
Notes payable maturity amount |  | $ 1,900,000 |  |  |  | $ 1,900,000 |  | $ 1,900,000 |  |
Debt instrument, conversion price |  | $ 1.75 |  |  |  | $ 1.75 |  | $ 1.75 |  |
June 2018 Convertible Note [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 8.00% |  |  |  |  |
Notes payable terms |  |  |  |  |  |  |  | The June 2018 Notes bear 8% interest payable upon maturity. Of the $3.3 million in issued June 2018 Notes, $2.5 million matures in six months; the balance of $0.8 million is payable in twelve installments beginning seven months after the original issuance date. |  |
Debt instrument, conversion price |  |  |  |  | $ 3.00 |  |  |  |  |
Maximum required market price of common shares, to settle notes payable in cash |  |  |  |  | $ 3.00 |  |  |  |  |
June 2018 Convertible Note [Member] | Securities Purchase Agreement [Member] | Matures in Six Months [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes payable maturity amount |  |  |  |  | $ 2,500,000 |  |  |  |  |
June 2018 Convertible Note [Member] | Securities Purchase Agreement [Member] | Payable in Twelve Installments Beginning Seven Months After Original Issuance Date [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes payable maturity amount |  |  |  |  | 800,000 |  |  |  |  |
June 2018 Convertible Note [Member] | June 2018 Series D Warrants [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  |  |  | 3,300,000 |  |  |  |  |
Proceeds from issuance of notes and warrants |  |  |  |  | 2,400,000 |  |  |  |  |
Debt discount on senior notes |  |  |  |  | 1,100,000 |  |  |  |  |
June 2018 Convertible Note [Member] | June 2018 Pre-Funded Series D Warrants [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  |  |  | $ 200,000 |  |  |  |  |
July 2018 Convertible Note [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  | $ 2,200,000 |  |  |  | $ 2,200,000 |  | $ 2,200,000 |  |
Debt discount on senior notes |  | $ 1,700,000 |  |  |  | $ 1,700,000 |  | $ 1,700,000 |  |
Interest rate |  | 8.00% |  |  |  | 8.00% |  | 8.00% |  |
Notes payable maturity amount |  | $ 500,000 |  |  |  | $ 500,000 |  | $ 500,000 |  |
Debt instrument, conversion price |  | $ 1.75 |  |  |  | $ 1.75 |  | $ 1.75 |  |
July 2018 Convertible Note [Member] | Second Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  |  | 2,200,000 |  |  |  |  |  |
Proceeds from issuance of notes and warrants |  |  |  | 1,600,000 |  |  |  |  |  |
Debt discount on senior notes |  |  |  | 700,000 |  |  |  |  |  |
Notes payable terms |  |  |  |  |  |  |  | Of the $2.2 million in issued July 2018 Notes, $1.6 million matures in six months; the balance of $0.6 million is payable in twelve installments beginning seven months after the original issuance date. |  |
July 2018 Convertible Note [Member] | Second Securities Purchase Agreement [Member] | Matures in Six Months [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes payable maturity amount |  |  |  | 1,600,000 |  |  |  |  |  |
July 2018 Convertible Note [Member] | Second Securities Purchase Agreement [Member] | Payable in Twelve Installments Beginning Seven Months After Original Issuance Date [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes payable maturity amount |  |  |  | 600,000 |  |  |  |  |  |
July 2018 Convertible Note [Member] | July 2018 Pre-Funded Series D Warrants [Member] | Second Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  |  | $ 100,000 |  |  |  |  |  |
August 2018 Convertible Note and Series D Warrant and Series D Pre-Funded Warrant [Member] | Third Securities Purchase Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  | 6,000 |  |  |  |  |  |  |
August 2018 Convertible Note [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  | $ 3,300,000 |  |  |  | $ 3,300,000 |  | $ 3,300,000 |  |
Debt discount on senior notes |  | $ 2,900,000 |  |  |  | $ 2,900,000 |  | $ 2,900,000 |  |
Interest rate |  | 8.00% |  |  |  | 8.00% |  | 8.00% |  |
Notes payable maturity amount |  | $ 400,000 |  |  |  | $ 400,000 |  | $ 400,000 |  |
Debt instrument, conversion price |  | $ 1.75 |  |  |  | $ 1.75 |  | $ 1.75 |  |
August 2018 Convertible Note [Member] | Third Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  | 3,300,000 |  |  |  |  |  |  |
Proceeds from issuance of notes and warrants |  |  | 2,500,000 |  |  |  |  |  |  |
Debt discount on senior notes |  |  | $ 1,100,000 |  |  |  |  |  |  |
Interest rate |  |  | 8.00% |  |  |  |  |  |  |
Notes payable terms |  |  |  |  |  |  |  | Of the $3.3 million in issued August 2018 Notes, $2.5 million matures in six months; the balance of $0.8 million is payable in twelve installments beginning seven months after the original issuance date. |  |
August 2018 Convertible Note [Member] | Third Securities Purchase Agreement [Member] | Matures in Six Months [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes payable maturity amount |  |  | $ 2,500,000 |  |  |  |  |  |  |
August 2018 Convertible Note [Member] | Third Securities Purchase Agreement [Member] | Payable in Twelve Installments Beginning Seven Months After Original Issuance Date [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes payable maturity amount |  |  | 800,000 |  |  |  |  |  |  |
August 2018 Convertible Note [Member] | August 2018 Pre-Funded Series D Warrants [Member] | Third Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  | $ 200,000 |  |  |  |  |  |  |
September 2018 Convertible Note [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  | $ 500,000 |  |  |  | $ 500,000 |  | $ 500,000 |  |
Debt discount on senior notes |  | $ 500,000 |  |  |  | $ 500,000 |  | $ 500,000 |  |
Interest rate |  | 8.00% |  |  |  | 8.00% |  | 8.00% |  |
Debt instrument, conversion price |  | $ 1.75 |  |  |  | $ 1.75 |  | $ 1.75 |  |
September 2018 Convertible Note [Member] | Fourth Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  | $ 500,000 |  |  |  | $ 500,000 |  | $ 500,000 |  |
Proceeds from issuance of notes and warrants |  | 400,000 |  |  |  |  |  |  |  |
Debt discount on senior notes |  | $ 200,000 |  |  |  | 200,000 |  | 200,000 |  |
Notes payable terms |  | Of the $0.5 million in issued September 2018 Notes, $0.4 million matures in six months; the balance of $0.1 million is payable in twelve installments beginning seven months after the original issuance date. |  |  |  |  |  |  |  |
September 2018 Convertible Note [Member] | Fourth Securities Purchase Agreement [Member] | Matures in Six Months [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes payable maturity amount |  | $ 400,000 |  |  |  | 400,000 |  | 400,000 |  |
September 2018 Convertible Note [Member] | Fourth Securities Purchase Agreement [Member] | Payable in Twelve Installments Beginning Seven Months After Original Issuance Date [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes payable maturity amount |  | 100,000 |  |  |  | 100,000 |  | 100,000 |  |
September 2018 Convertible Note [Member] | July 2018 Pre-Funded Series D Warrants [Member] | Fourth Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  | $ 30,000 |  |  |  | $ 30,000 |  | $ 30,000 |  |

X
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