Investments - Summary of Available For Sale and Held to Maturity Securities Amortized Cost Gross Unrealized Gains Losses and Fair Value (Detail) - USD ($)
$ in Thousands |
Dec. 31, 2021 |
Dec. 31, 2020 |
| Schedule Of Available For Sale And Held To Maturity Securities Amortised Cost Gross Unrealised Gains Losses And Fair Value [Line Items] |
|
|
| Fixed-Maturity Securities, Amortized Cost, Total investments |
$ 19,068
|
|
| Held-to-maturity securities, Estimated Fair Value |
19,028
|
|
| Total Held-to-maturity securities and Available for-sale securities Amortized Cost |
19,068
|
$ 23,062
|
| Total Held-to-maturity securities and Available for-sale securities Gross Unrealized Gain |
|
82
|
| Total Held-to-maturity securities and Available for-sale securities Gross Unrealized Loss |
(40)
|
|
| Total Held-to-maturity securities and Available for-sale securities Estimated Fair Value |
19,028
|
23,144
|
| U.S. Treasury bonds [Member] |
|
|
| Schedule Of Available For Sale And Held To Maturity Securities Amortised Cost Gross Unrealised Gains Losses And Fair Value [Line Items] |
|
|
| Fixed-Maturity Securities, Amortized Cost, Total investments |
|
10,002
|
| Held-to-maturity securities, Gross Unrealized Gain |
|
14
|
| Held-to-maturity securities, Estimated Fair Value |
|
10,016
|
| Available-for-sale securities, Amortized Cost |
15,146
|
13,060
|
| Available-for-sale securities, Gross Unrealized Gain |
|
68
|
| Available-for-sale securities, Gross Unrealized Loss |
(36)
|
|
| Available-for-sale securities, Estimated Fair Value |
15,110
|
$ 13,128
|
| Certificates of deposit [Member] |
|
|
| Schedule Of Available For Sale And Held To Maturity Securities Amortised Cost Gross Unrealised Gains Losses And Fair Value [Line Items] |
|
|
| Available-for-sale securities, Amortized Cost |
3,922
|
|
| Available-for-sale securities, Gross Unrealized Loss |
(4)
|
|
| Available-for-sale securities, Estimated Fair Value |
$ 3,918
|
|