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Equity Incentive Plan - Stock option awards (Details) - Stock option awards
3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options outstanding (shares) | shares 11,362
Weighted-average exercise price of options outstanding (USD per share) | $ / shares $ 257.42
Weighted-average remaining contractual term of options outstanding 3 years 9 months
Aggregate intrinsic value of options vested and exercisable | $ $ 0