Redeemable Convertible Preferred Stock - Temporary equity (Detail) - USD ($)
$ in Thousands |
Mar. 31, 2021 |
Mar. 31, 2020 |
| Temporary Equity [Line Items] |
|
|
| Shares Authorized |
91,342,476
|
86,443,341
|
| Shares Issued |
91,198,378
|
86,443,341
|
| Shares Outstanding |
91,198,378
|
86,443,341
|
| Carrying Value |
$ 837,351
|
$ 755,083
|
| Aggregate Liquidation Preference |
$ 874,107
|
$ 791,607
|
| Series A |
|
|
| Temporary Equity [Line Items] |
|
|
| Shares Authorized |
7,119,936
|
7,119,936
|
| Shares Issued |
7,119,936
|
7,119,936
|
| Shares Outstanding |
7,119,936
|
7,119,936
|
| Carrying Value |
$ 8,815
|
$ 8,815
|
| Aggregate Liquidation Preference |
$ 8,953
|
$ 8,953
|
| Series B |
|
|
| Temporary Equity [Line Items] |
|
|
| Shares Authorized |
9,048,560
|
9,048,560
|
| Shares Issued |
9,048,560
|
9,048,560
|
| Shares Outstanding |
9,048,560
|
9,048,560
|
| Carrying Value |
$ 27,643
|
$ 27,643
|
| Aggregate Liquidation Preference |
$ 27,779
|
$ 27,779
|
| Series C |
|
|
| Temporary Equity [Line Items] |
|
|
| Shares Authorized |
9,898,011
|
9,898,011
|
| Shares Issued |
9,898,011
|
9,898,011
|
| Shares Outstanding |
9,898,011
|
9,898,011
|
| Carrying Value |
$ 30,961
|
$ 30,961
|
| Aggregate Liquidation Preference |
$ 31,179
|
$ 31,179
|
| Series D |
|
|
| Temporary Equity [Line Items] |
|
|
| Shares Authorized |
14,435,636
|
14,435,636
|
| Shares Issued |
14,435,636
|
14,435,636
|
| Shares Outstanding |
14,435,636
|
14,435,636
|
| Carrying Value |
$ 58,274
|
$ 58,274
|
| Aggregate Liquidation Preference |
$ 58,450
|
$ 58,450
|
| Series E |
|
|
| Temporary Equity [Line Items] |
|
|
| Shares Authorized |
10,644,057
|
10,644,057
|
| Shares Issued |
10,644,057
|
10,644,057
|
| Shares Outstanding |
10,644,057
|
10,644,057
|
| Carrying Value |
$ 114,936
|
$ 114,936
|
| Aggregate Liquidation Preference |
$ 115,246
|
$ 115,246
|
| Series F |
|
|
| Temporary Equity [Line Items] |
|
|
| Shares Authorized |
18,006,075
|
18,006,075
|
| Shares Issued |
18,006,075
|
18,006,075
|
| Shares Outstanding |
18,006,075
|
18,006,075
|
| Carrying Value |
$ 242,168
|
$ 242,168
|
| Aggregate Liquidation Preference |
$ 250,000
|
$ 250,000
|
| Series F-1 |
|
|
| Temporary Equity [Line Items] |
|
|
| Shares Authorized |
22,190,201
|
17,291,066
|
| Shares Issued |
22,046,103
|
17,291,066
|
| Shares Outstanding |
22,046,103
|
17,291,066
|
| Carrying Value |
$ 354,554
|
$ 272,286
|
| Aggregate Liquidation Preference |
$ 382,500
|
$ 300,000
|