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Subsequent Events - Additional Information (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 11, 2019 | May 23, 2019 | Mar. 31, 2019 | Jun. 06, 2019 | Dec. 31, 2018
Subsequent Event [Line Items] |  |  |  |  |
Debt instrument, principal face amount |  |  | $ 6,100,000 |  | $ 4,500,000
Preferred stock, par value (in dollars per share) |  |  | $ 0.01 |  | $ 0.01
Common stock, par value (in dollars per share) |  |  | 0.01 |  | 0.01
warrant ,exercise price |  |  | $ 0.23 |  | $ 0.22
Warrants exercised |  |  | 4,119,500 |  |
Pre-Funded Series D Warrants [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Warrants exercised |  |  | 3,800,000 |  |
Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Aggregate borrowed amount |  | $ 3,300,000 |  |  |
Debt instrument, principal face amount |  | $ 3,300,000 |  | $ 2,000,000 |
Interest rate on promissory note |  | 8.00% |  | 8.00% |
Maturity period |  | 6 months |  |  |
Subsequent Event [Member] | Roth Capital Partners, LLC [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Payments to private placement agent | $ 552,000 |  |  |  |
Subsequent Event [Member] | Series E Convertible Preferred Stock [Member] | Private Placement [Member] | Scenario Plan [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Expected proceeds from private placement, gross | 20,000,000 |  |  |  |
Subsequent Event [Member] | Series E Convertible Preferred Stock [Member] | Private Placement [Member] | Roth Capital Partners, LLC [Member] | Scenario Plan [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Payments to private placement agent | $ 1,400,000 |  |  |  |
Subsequent Event [Member] | Series E Convertible Preferred Stock [Member] | Private Placement [Member] | Securities Purchase Agreement [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of shares issued | 20,000 |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.01 |  |  |  |
Shares issued, price per share | 1,000 |  |  |  |
Subsequent Event [Member] | Series D Warrants [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of warrants available for cancellation |  |  |  | 3,900,000 |
Subsequent Event [Member] | Pre-Funded Series D Warrants [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of warrants available for cancellation |  |  |  | 53,400,000 |
Subsequent Event [Member] | Warrants |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
warrant ,exercise price | $ 0.06 |  |  |  |
Warrant exercisible term | 5 years |  |  |  |
Subsequent Event [Member] | Warrants | Securities Purchase Agreement [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |  |  |

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