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v3.19.3

Convertible Notes Payable - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 06, 2019 | Sep. 21, 2018 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 8.00% |  |
Debt instrument, principal face amount |  |  |  | $ 10,500,000 |  | $ 10,500,000 |  | $ 4,500,000 |  | $ 2,000,000 |  |
Exercise price of warrants |  |  |  | $ 0.23 |  | $ 0.23 |  | $ 0.22 | $ 1,569 |  |  | $ 910,000
Debt discount on senior notes |  |  |  | $ 200,000 |  | $ 200,000 |  | $ 2,500,000 |  |  |  |
Loss on issuance of financial instrument |  |  |  | 6,000 | $ 2,826,000 | 6,000 | $ 2,826,000 | 2,826,000 | $ 0 |  |  |
Fair value of warrants being reclassified from liability to equity |  |  |  |  |  | 7,000 |  | 4,210,000 |  |  |  |
Loss on debt extinguishment |  |  |  |  |  |  |  | 0 | $ (9,613,000) |  |  |
Notes payable maturity amount |  |  |  | $ 10,300,000 |  | $ 10,300,000 |  | $ 2,000,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants |  |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 | $ 1,225 |  |  | 281,750
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants |  |  |  | $ 10.00 |  | $ 10.00 |  | 10.00 | $ 19,712,000 |  |  | $ 19,712,000
June 2018 Series D Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares issuable upon warrants exercised |  |  | 4.2 |  | 4.2 |  | 4.2 |  |  |  |  |
Warrants expiration period |  |  | 5 years |  | 5 years |  | 5 years |  |  |  |  |
Warrants value |  |  | $ 5,100,000 |  | $ 5,100,000 |  | $ 5,100,000 |  |  |  |  |
Debt discount on senior notes |  |  | 2,300,000 |  | $ 2,300,000 |  | $ 2,300,000 |  |  |  |  |
Loss on issuance of financial instrument |  |  | $ 2,800,000 |  |  |  |  |  |  |  |  |
June 2018 Series D Warrants [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants |  |  | $ 1.75 |  | $ 1.75 |  | $ 1.75 |  |  |  |  |
June 2018 Series D Warrants [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants |  |  | $ 4.00 |  | $ 4.00 |  | $ 4.00 |  |  |  |  |
June 2018 Pre-Funded Series D Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares issuable upon warrants exercised | 22.2 |  | 65.0 |  | 65.0 |  | 65.0 |  |  |  |  |
Exercise price of warrants |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 |  |  |  |  |
Warrants expiration period |  |  | 5 years |  | 5 years |  | 5 years |  |  |  |  |
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 |  | 13.0 |  | 13.0 |  |  |  |  |
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 Two Thousand Eighteen Pre Funded Series D Warrants |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares issuable upon warrants exercised | 15.8 |  |  |  |  |  |  |  |  |  |  |
July Two Thousand Eighteen Pre Funded Series D Warrants | Second Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares issuable upon warrants exercised |  | 9.2 |  |  |  |  |  |  |  |  |  |
Senior Secured Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 8.00% |
Debt instrument, principal face amount |  |  |  |  |  |  |  |  |  |  | $ 9,400,000 |
Debt instrument, conversion price |  |  |  |  |  |  |  | $ 1.75 |  |  |  |
Debt instrument maturity start date |  |  |  |  |  | Dec. 31, 2018 |  | Dec. 31, 2018 |  |  |  |
Debt instrument maturity end date |  |  |  |  |  | Mar. 31, 2021 |  | Mar. 31, 2021 |  |  |  |
August 2018 Convertible Note [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes payable maturity amount | $ 2,500 |  |  |  |  |  |  |  |  |  |  |

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