Stock Based Compensation - Stock option activity (Details) - USD ($)
$ / shares in Units, $ in Thousands |
3 Months Ended |
9 Months Ended |
12 Months Ended |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Mar. 31, 2019 |
| Number of Shares |
|
|
|
|
|
| Outstanding at beginning of the period (in shares) |
|
|
3,721,784
|
|
|
| Granted (in shares) |
|
|
1,515,535
|
|
|
| Exercised (in shares) |
|
|
(184,580)
|
|
|
| Cancelled (in shares) |
|
|
(136,337)
|
|
|
| Outstanding at end of the period (in shares) |
4,916,402
|
|
4,916,402
|
|
3,721,784
|
| Options exercisable (in shares) |
1,924,564
|
|
1,924,564
|
|
1,278,930
|
| Weighted Average Exercise Price |
|
|
|
|
|
| Outstanding at beginning of the period (in dollars per share) |
|
|
$ 7.14
|
|
|
| Granted (in dollars per share) |
|
|
15.00
|
|
|
| Exercised (in dollars per share) |
|
|
2.60
|
|
|
| Cancelled (in dollars per share) |
|
|
11.26
|
|
|
| Outstanding at end of the period (in dollars per share) |
$ 9.46
|
|
9.46
|
|
$ 7.14
|
| Options exercisable (in dollars per share) |
$ 5.33
|
|
$ 5.33
|
|
$ 2.51
|
| Weighted Average Contractual Term (Years) |
|
|
|
|
|
| Outstanding (years) |
|
|
8 years 2 months 12 days
|
|
8 years 7 months 10 days
|
| Granted (years) |
|
|
9 years 4 months 28 days
|
|
|
| Options exercisable (years) |
|
|
7 years 4 months 24 days
|
|
7 years 9 months
|
| Aggregate Intrinsic Value |
|
|
|
|
|
| Outstanding at beginning of the period |
|
|
$ 30,150
|
|
|
| Outstanding at end of the period |
$ 26,959
|
|
26,959
|
|
$ 30,150
|
| Options exercisable |
17,650
|
|
17,650
|
|
$ 16,249
|
| Total fair value of options vested |
$ 1,063
|
$ 211
|
$ 4,480
|
$ 1,042
|
|
| Outstanding unvested service-based stock options |
0
|
|
0
|
|
|