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Short-Term Investments (Tables) | 6 Months Ended
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Sep. 30, 2017
Summary of Investment Holdings [Line Items] |
Schedule of amortized cost and fair value of investment securities held-to-maturity |
|  |  | Investment Securities Held-to-Maturity |  |  | Estimated |
|  |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | fair value |
| At September 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |
| Corporate debt securities |  | $ | 1,997,792 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,997,792 |
| Other debt securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
|  |  | $ | 1,997,792 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,997,792 |
| At March 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate debt securities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
| Other debt securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
|  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Investment securities [Member] |
Summary of Investment Holdings [Line Items] |
Schedule of amortized cost and fair value of investment securities held-to-maturity |
|  |  | September 30, 2017 |  |  | March 31, 2017 |
| Due in one year or less |  | $ | 1,997,792 |  |  | $ | — |
| Due after one year through five years |  |  | — |  |  |  | — |
| Due after five years through ten years |  |  | — |  |  |  | — |
| Due after ten years |  |  | — |  |  |  | — |
| Total |  | $ | 1,997,792 |  |  | $ | — |

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