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Convertible Preferred Stock and Stockholders’ Equity (Deficit) (Tables) | 12 Months Ended
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Dec. 31, 2019
Stockholders Equity Note [Abstract] |
Schedule of Reserved Common Stock on an if-Converted Basis for Issuance | As of December 31, 2019 and 2018, the Company had reserved common stock, on an if-converted basis, for issuance as follows:
|  | As of December 31, |
|  | 2019 |  |  | 2018 |
Common stock options issued and outstanding |  |  | 4,738,004 |  |  |  | 1,458,080 |
Remaining shares available for issuance under 2015 & 2018 Stock Plan |  |  | 2,315,099 |  |  |  | 3,801,191 |
Unvested restricted stock issued as part of collaboration agreement |  |  | 1,257,651 |  |  |  | - |
Total |  |  | 8,310,754 |  |  |  | 5,259,271 |

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