Fair Value Measurement - Warrants (Details) - Warrant - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||
| Fair value, liability, beginning balance | $ 1,822,819 | $ 0 |
| Fair value of new issuances | 0 | 4,506,289 |
| Change in fair value for the year | 15,369,253 | (2,683,470) |
| Reclassification to additional paid-in capital | (857,072) | 0 |
| Fair value, liability, ending balance | $ 16,335,000 | $ 1,822,819 |