Stock-Based Compensation - Stock Option Activity (Details) - $ / shares
|
3 Months Ended |
12 Months Ended |
Mar. 31, 2022 |
Dec. 31, 2021 |
| Stock-Based Compensation |
|
|
| Number of Options, Outstanding at beginning of year |
515,922
|
|
| Number of Options, Granted |
260,500
|
|
| Number of Options, Expired |
(12,662)
|
|
| Number of Options, Forfeited |
(85,610)
|
|
| Number of Options, Outstanding at end of year |
678,150
|
515,922
|
| Number of Options Exercisable and vested at the end |
241,683
|
|
| Weighted- Average Exercise Price, Outstanding at beginning of year |
$ 10.43
|
|
| Weighted- Average Exercise Price, Granted |
0.76
|
|
| Weighted- Average Exercise Price, Expired |
6.87
|
|
| Weighted- Average Exercise Price, Forfeited |
2.79
|
|
| Weighted- Average Exercise Price, Outstanding at end of year |
7.85
|
$ 10.43
|
| Weighted- Average Exercise Price, Vested and expected to vest at end of year |
$ 18.57
|
|
| Weighted-Average Remaining Contractual Life (In Years), Outstanding |
8 years 6 months 18 days
|
8 years 3 months 18 days
|
| Weighted-Average Remaining Contractual Life (In Years), Granted |
9 years 10 months 2 days
|
|
| Weighted-Average Remaining Term in Years Exercisable and vested at the end |
2 years 3 months 18 days
|
|