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Stockholders' Equity - Restricted Stock Units (Details) - Restricted Stock Units - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Total Restricted Stock Units |  |  |
Non-vested at beginning of period (in shares) | 11,301 |  |
Vested (in shares) | (10,310) |  |
Non-vested at end of period (in shares) | 991 |  |
Weighted-Average Grant Date Fair Value Per Share |  |  |
Nonvested, weighted average grant date fair value at end of period (in USD per share) | $ 15.38 |  |
Vested, weighted average grant date fair value (in USD per share) | 9.76 |  |
Nonvested, weighted average grant date fair value at end of period (in USD per share) | $ 73.84 |  |
Equity instruments other than options, aggregate intrinsic value, nonvested | $ 14,062 |  | $ 14,013
Equity instruments other than options, aggregate intrinsic value, vested | 22,875 |  |
Equity instruments other than options, vested in period, fair value | $ 100,585 | $ 169,563 |

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