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Redeemable Preferred Stocks - Summary of Redeemable Preferred Stocks Exchanged for Common Stock (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  | $ 1,000,000.0 |  |  |  |  | $ 1,000,000.0 |  |
Accumulated dividends |  |  |  |  |  |  |  | 29,914,000 | $ 35,182,000 | $ 30,729,000
Change in fair value of embedded derivative | $ 1,106,000 | $ 716,000 | 436,000 | $ 561,000 | $ 141,000 | $ (120,000) | $ (637,000) |  |  |
Ending balance |  |  |  | 1,000,000.0 |  |  |  |  | 1,000,000.0 |
Series E Redeemable Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  | $ 272,101,000 |  |  |  |  | $ 272,101,000 |  |
Beginning balance, shares |  |  | 139,768 |  |  |  |  | 139,768 |  |
Accretion relating to liquidation preference on preferred stock |  |  |  |  |  |  |  | $ 814,000 |  |
Accretion for discount and issuance costs on preferred stock |  |  |  |  |  |  |  | 709,000 |  |
Accumulated dividends |  |  |  |  |  |  |  | 29,914,000 | 35,182,000 | $ 30,729,000
Costs relating to exchange transaction |  |  |  |  |  |  |  | (7,497,000) |  |
Exchange of preferred stock for common stock |  |  |  |  |  |  |  | $ (296,041,000) |  |
Exchange of preferred stock for common stock, shares |  |  |  |  |  |  |  | (139,768) |  |
Ending balance |  |  |  | 272,101,000 |  |  |  |  | 272,101,000 |
Series E Redeemable Preferred Stock [Member] | Accrued Liability Embedded Derivative [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  | $ 1,029,000 |  |  |  |  | $ 1,029,000 |  |
Change in fair value of embedded derivative |  |  |  |  |  |  |  | 2,258,000 |  |
Exchange of preferred stock for common stock |  |  |  |  |  |  |  | $ (3,287,000) |  |
Ending balance |  |  |  | $ 1,029,000 |  |  |  |  | $ 1,029,000 |
Series F Redeemable Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Beginning balance, shares |  |  | 1 |  |  |  |  | 1 |  |
Exchange of preferred stock for common stock, shares |  |  |  |  |  |  |  | (1) |  |

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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
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- Definition The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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