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Stockholders' Equity - Restricted Stock Units (Details) - Restricted Stock Units - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Total Restricted Stock Units |  |  |
Non-vested at beginning of period (in shares) | 491 |  |
Vested (in shares) | (491) |  |
Non-vested at end of period (in shares) | 0 |  |
Weighted-Average Grant Date Fair Value Per Share |  |  |
Nonvested, weighted average grant date fair value at end of period (in USD per share) | $ 147.60 |  |
Vested, weighted average grant date fair value (in USD per share) | 147.60 |  |
Nonvested, weighted average grant date fair value at end of period (in USD per share) | $ 0 |  |
Equity instruments other than options, aggregate intrinsic value, nonvested | $ 0 |  | $ 8,833
Equity instruments other than options, vested in period, fair value | $ 100,000 | $ 100,000 |

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