Stock compensation expense - Summary of Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands |
3 Months Ended |
12 Months Ended |
Mar. 31, 2022 |
Dec. 31, 2021 |
| Number of Stock Options |
|
|
| Beginning balance outstanding (in shares) |
24,255,204
|
|
| Granted (in shares) |
0
|
|
| Exercised (in shares) |
(924,717)
|
|
| Cancelled or forfeited (in shares) |
(241,210)
|
|
| Ending balance outstanding (in shares) |
23,089,277
|
24,255,204
|
| Options exercisable, Number of Stock Options (in shares) |
11,853,819
|
|
| Weighted Average Exercise Price ($) |
|
|
| Beginning balance outstanding (in usd per share) |
$ 0.51
|
|
| Granted (in usd per share) |
0
|
|
| Exercised (in usd per share) |
0.52
|
|
| Cancelled or forfeited (in usd per share) |
0.68
|
|
| Ending balance outstanding (in usd per share) |
0.59
|
$ 0.51
|
| Options exercisable, Weighted Average Exercise Price (in usd per share) |
$ 0.53
|
|
| Stock Option Activity, Additional Disclosures |
|
|
| Outstanding balance, Weighted Average Remaining Contractual Life |
7 years 7 months 28 days
|
7 years 10 months 28 days
|
| Granted, Weighted Average Remaining Contractual Life |
0 days
|
|
| Exercised, Weighted Average Remaining Contractual Life |
7 years 6 months 18 days
|
|
| Cancelled or forfeited, Weighted Average Remaining Contractual Life |
8 years 1 month 28 days
|
|
| Options Exercisable, Weighted Average Remaining Contractual Life |
7 years 4 months 17 days
|
|
| Beginning balance outstanding, Aggregate Intrinsic Value |
$ 109,061
|
|
| Ending balance outstanding, Aggregate Intrinsic Value |
36,586
|
$ 109,061
|
| Options exercisable, Aggregate Intrinsic Value |
$ 19,403
|
|