Shareholders' Equity (Detail Textuals) - shares |
3 Months Ended | 6 Months Ended | |
|---|---|---|---|
Mar. 31, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
|
| Schedule Of Stockholders Equity [Line Items] | |||
| Stock option granted | 215,500 | ||
| Class A common stock | |||
| Schedule Of Stockholders Equity [Line Items] | |||
| Conversion of 2018 Notes (in shares) | 894,836 | 5,109,553 | 894,836 |
| Proceeds from warrant exercises related to 2018 Note Offering (in shares) | 210,000 | 200,000 | |
| Class A common stock | Series Q warrants | |||
| Schedule Of Stockholders Equity [Line Items] | |||
| Proceeds from warrant exercises related to 2018 Note Offering (in shares) | 210,000 | ||
| Class A common stock | Series S warrants | |||
| Schedule Of Stockholders Equity [Line Items] | |||
| Number of shares called by warrants | 1,430,141 | ||
| Class A common stock | Series R warrants | |||
| Schedule Of Stockholders Equity [Line Items] | |||
| Number of shares called by warrants | 3,688,935 | ||