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Outstanding Debt - Additional Information (Details) - USD ($) |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 29, 2019 | May 23, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 06, 2019 | Apr. 30, 2019 | Sep. 21, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  |  |  | 8.00% |  |
Debt instrument, principal face amount |  |  | $ 10,500,000 | $ 4,500,000 | $ 2,000,000 |  |
Short Term Notes Payable [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  | $ 9,900,000 |  |  |  |
Series D Preferred Shares [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate | 8.00% |  |  |  |  |  |
Preferred stock, stated value | $ 1,160,000 |  |  |  |  |  |
Proceeds from exchange of senior secured promissory note | 400,000 |  |  |  |  |  |
Issuance of senior secured promissory note in exchange of preferred stock | $ 1,560,000 |  |  |  |  |  |
Maturity date | Apr. 01, 2020 |  |  |  |  |  |
Senior Secured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  | 8.00% |  |  |  |  |
Debt instrument, principal face amount |  | $ 3,300,000 |  |  |  |  |
Maturity period |  | 6 months |  |  |  |  |
Senior Secured Convertible Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 8.00%
Debt instrument, principal face amount |  |  |  |  |  |  | $ 9,400,000
Debt instrument maturity start date |  |  | Dec. 31, 2018 | Dec. 31, 2018 |  |  |
Debt instrument maturity end date |  |  | Mar. 31, 2021 | Mar. 31, 2021 |  |  |
8.0% 2018 Notes [Member] | Short Term Notes Payable [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  | 18.00% |  |  |  |
Debt instrument, principal face amount |  |  | $ 5,000,000 |  |  |  |
Debt instrument, notice of default description |  |  | Company received notices of default from the investors in the 2018 Notes which resulted in a 25%, or $1.1 million, increase in principal and an increase in the interest rates from 8% to 18%. |  |  |  |
Debt instrument, default amount percentage |  |  |  |  |  | 25.00% |
Debt instrument, default amount |  |  |  |  |  | $ 1,100,000 |
Increase in interest rate on notes in event of default |  |  |  |  |  | 18.00% |

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