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v3.19.2

Subsequent Events - Additional Information (Details) - USD ($) |  |  | 1 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 11, 2019 | Mar. 29, 2019 | Mar. 29, 2019 | May 23, 2019 | Jun. 30, 2019 | Jun. 06, 2019 | Jan. 31, 2019 | Dec. 31, 2018 | Nov. 06, 2018 | Nov. 05, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  |  |  | $ 10,500,000 | $ 2,000,000 |  | $ 4,500,000 |  |  |  |
Interest rate on promissory note |  |  |  |  |  | 8.00% |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  |  | $ 0.01 |
Exercise price of warrants |  |  |  |  | 0.23 |  |  | 0.22 |  |  | 1,569 | $ 910,000
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  |  | $ 3,300,000 |  | $ 2,000,000 |  |  |  |  |  |
Interest rate on promissory note |  |  |  | 8.00% |  | 8.00% |  |  |  |  |  |
Common stock subscription price per share |  |  |  |  |  |  | $ 1.75 |  |  |  |  |
Aggregate borrowed amount |  |  |  | $ 3,300,000 |  |  |  |  |  |  |  |
Maturity period |  |  |  | 6 months |  |  |  |  |  |  |  |
Roth Capital Partners, LLC [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to private placement agent | $ 600,000 |  |  |  |  |  |  |  |  |  |  |
Series E Preferred Stock [Member] | Private Placement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from private placement, gross | 20,000,000 |  |  |  |  |  |  |  |  |  |  |
Series E Preferred Stock [Member] | Private Placement [Member] | Roth Capital Partners, LLC [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to private placement agent | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |
Series E Preferred Stock [Member] | Private Placement [Member] | Securities Purchase Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued | 20,000 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share | 1,000 |  |  |  |  |  |  |  |  |  |  |
Series D Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on promissory note |  | 8.00% | 8.00% |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.01 |  |
Preferred stock, stated value |  | $ 1,160,000 | $ 1,160,000 |  |  |  |  |  |  |  |  |
Issuance of senior secured promissory note in exchange of preferred stock |  | $ 1,560,000 | $ 1,560,000 |  |  |  |  |  |  |  |  |
Maturity date |  | Apr. 01, 2020 |  |  |  |  |  |  |  |  |  |
Series D Preferred Shares [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on promissory note |  | 8.00% | 8.00% |  |  |  |  |  |  |  |  |
Preferred stock, stated value |  | $ 1,160,000 | $ 1,160,000 |  |  |  |  |  |  |  |  |
Proceeds from exchanage of preferred stock |  |  | 400,000 |  |  |  |  |  |  |  |  |
Issuance of senior secured promissory note in exchange of preferred stock |  | $ 1,560,000 | $ 1,560,000 |  |  |  |  |  |  |  |  |
Maturity date |  |  | Apr. 01, 2020 |  |  |  |  |  |  |  |  |
Series D Preferred Shares [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  |  |  |  |  |  | 101 |  |  |
Series D Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issuable on cancellation of warrants |  |  |  |  |  | 3,900,000 |  |  |  |  |  |
Series D Warrants [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants available for cancellation |  |  |  |  |  | 3,900,000 |  |  |  |  |  |
Pre-Funded Series D Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issuable on cancellation of warrants |  |  |  |  |  | 53,400,000 |  |  |  |  |  |
Pre-Funded Series D Warrants [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issuable on cancellation of warrants |  |  |  |  |  |  | 7,900,000 |  |  |  |  |
Number of warrants available for cancellation |  |  |  |  |  | 53,400,000 |  |  |  |  |  |
2019 Warrants [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ 0.06 |  |  |  |  |  |  |  |  |  |  |
Warrant exercisable term | 5 years |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants |  |  |  |  | 10.00 |  |  | 10.00 |  |  | 19,712,000 | 19,712,000
Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock subscription price |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  |  | $ 1,225 | $ 281,750

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