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Notes Payable - Additional Information (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
May 07, 2021 | May 08, 2020 | Feb. 24, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Notes Payable |  |  |  |  |  |  |
Repayments of loan |  |  |  |  |  | $ 311,563 | $ 209,324
Long-term Debt |  |  |  | $ 7,500,000 |  | 7,500,000 |
Interest expense |  |  |  | 4,481 | $ 4,333 | 6,963 | $ 6,032
Fair Value Adjustment of Warrants |  |  |  | $ 354,539 |  |  |
Expected term (years) |  |  |  |  | 5 years 10 months 6 days |  | 5 years 10 months 6 days
Expected volatility |  |  |  | 93.00% | 99.00% |  |
Debt issuance costs |  |  |  |  |  | $ 66,618 |
Warrants |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Warrants for purchase of common stock |  |  |  | 877,014 |  | 877,014 |
Minimum |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Risk free interest rate |  |  |  | 0.80% | 0.34% | 0.45% | 0.34%
Expected term (years) |  |  |  | 5 years 10 months 6 days |  | 5 years 10 months 6 days |
Expected volatility |  |  |  |  |  | 93.00% | 96.00%
Minimum | Warrants |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Exercise Price of Warrants Outstanding |  |  |  | $ 2.058 |  | $ 2.058 |
Maximum |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Risk free interest rate |  |  |  | 1.58% | 0.38% | 1.58% | 1.32%
Expected term (years) |  |  |  | 10 years |  | 10 years |
Expected volatility |  |  |  |  |  | 94.00% | 99.00%
Maximum | Warrants |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Exercise Price of Warrants Outstanding |  |  |  | $ 2.4696 |  | $ 2.4696 |
Notes payable |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Number of monthly payments |  |  | 9 months |  |  |  |
Debt Instrument, Periodic Payment |  |  | $ 79,343 |  |  |  |
Aggregate principal payments |  |  | $ 705,360 |  |  |  |
Interest rate (as a percent) |  |  | 2.96% |  |  |  |
Paycheck Protection Program loan |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Debt Instrument, Periodic Payment |  | $ 19,508 |  |  |  |  |
Interest rate (as a percent) |  | 1.00% |  |  |  |  |
Cash proceeds from loan |  | $ 463,353 |  |  |  |  |
Period for usage of loan proceeds |  | 168 days |  |  |  |  |
Interest rate on non forgiven amount |  | 1.00% |  |  |  |  |
Paycheck Protection Program loan | Minimum |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Maturity term |  | 2 years |  |  |  |  |
Paycheck Protection Program loan | Maximum |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Maturity term |  | 5 years |  |  |  |  |
Silicon Valley Bank loan |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Aggregate principal amount | $ 25,000,000.0 |  |  |  |  |  |
Interest rate (as a percent) | 5.00% |  |  |  |  |  |
Maturity date | May 01, 2025 |  |  |  |  |  |
Debt instrument effective stated rate | 1.25% plus the prime rate |  |  |  |  |  |
Aggregate loan percentage | 5.00% |  |  |  |  |  |
Long-term Debt | $ 7,500,000 |  |  |  |  |  |
Warrants for purchase of common stock | 91,884 |  |  |  |  |  |
Exercise Price of Warrants Outstanding | $ 4.76 |  |  |  |  |  |
Warrant exercisable term | 10 years |  |  |  |  |  |
Loan received | $ 17,500,000 |  |  |  |  |  |
Interest expense |  |  |  |  |  | $ 54,516 |
Debt issuance costs |  |  |  |  |  | 66,618 |
Silicon Valley Bank loan | Debt |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | 63,469 |
Silicon Valley Bank loan | Warrants |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  |  |  |  | $ 354,539 |
Risk free interest rate |  |  |  |  |  | 1.60% |
Stock price |  |  |  | $ 4.76 |  | $ 4.76 |
Expected term (years) |  |  |  |  |  | 10 years |
Expected volatility |  |  |  |  |  | 89.00% |
Debt issuance costs |  |  |  |  |  | $ 3,149 |
Silicon Valley Bank loan | Prior to First Anniversary |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Prepayment fee percentage | 3.00% |  |  |  |  |  |
Silicon Valley Bank loan | Prior to Second Anniversary |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Prepayment fee percentage | 2.00% |  |  |  |  |  |
Silicon Valley Bank loan | Prior to Third Anniversary |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Prepayment fee percentage | 1.00% |  |  |  |  |  |
Silicon Valley Bank loan | Minimum |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Prepayment fee percentage | 1.00% |  |  |  |  |  |
Silicon Valley Bank loan | Maximum |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |
Prepayment fee percentage | 3.00% |  |  |  |  |  |

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