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Debt - Convertible Notes Other Information (Details) - USD ($) $ / shares in Units, $ in Millions | May 16, 2019 | Apr. 05, 2019 | Dec. 31, 2019 | Apr. 04, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Debt |  |  |  |  |
Common stock, shares agreed to be sold, stock subscription agreement (in shares) |  | 100,000 |  |  |
Common stock, value, subscriptions |  | $ 1.0 |  |  |
Price per share (in USD per share) |  | $ 12.41 |  |  |
Common stock, shares issued (in shares) |  |  | 52,746,728 |  | 4,960,552
Increase in additional paid-in capital from conversion | $ 0.9 | $ 13.0 |  |  |
Convertible promissory notes |  |  |  |  |
Debt |  |  |  |  |
Note Principal Amount |  |  |  | $ 0.9 |
Interest rate (as a percent) |  |  |  | 5.00% |
January 2019 and February 2019 notes | Convertible notes |  |  |  |  |
Debt |  |  |  |  |
Conversion price discount per original agreement (as a percent) |  |  | 15.00% |  |
November 2018 and December 2018 notes | Convertible notes | Minimum |  |  |  |  |
Debt |  |  |  |  |
Conversion price discount per original agreement (as a percent) |  |  | 0.00% |  |
Convertible notes |  |  |  |  |
Debt |  |  |  |  |
Common stock, shares issued (in shares) |  | 1,100,000 |  |  |
Extinguishment of debt loss |  | $ 0.3 |  |  |
Shares issued, price per share (in USD per share) |  | $ 8.69 |  |  |
Board members |  |  |  |  |
Debt |  |  |  |  |
Common stock, shares agreed to be sold, stock subscription agreement (in shares) |  | 40,286 |  |  |
Common stock, value, subscriptions |  | $ 0.5 |  |  |

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