Fair Value Measurements (Financial Assets Measured at Fair Value on a Recurring Basis) (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value	$ 30,494,000	$ 35,535,000
Business Combination, Contingent Consideration, Liability, Current	0	4,800,000
Business Combination, Contingent Consideration, Liability, Noncurrent		2,106,000
Financial Liabilities Fair Value Disclosure		6,906,000
Cash and cash equivalents	27,109,000	23,940,000
Cash and Cash Equivalents \| Cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value	27,109,000	23,940,000
Amortized Cost		23,940,000
Cash and Cash Equivalents \| Cash and Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	27,109,000
Investment [Domain] \| Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value	1,755,000	9,965,000
Restricted cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value	1,630,000	1,630,000
Amortized Cost	1,630,000	1,630,000
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value	28,739,000	25,570,000
Business Combination, Contingent Consideration, Liability, Current		0
Business Combination, Contingent Consideration, Liability, Noncurrent		0
Financial Liabilities Fair Value Disclosure		0
Level 1 \| Cash and Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value	27,109,000
Level 1 \| Cash and Cash Equivalents \| Cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value		23,940,000
Level 1 \| Investment [Domain] \| Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value	0
Level 1 \| Restricted cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value	1,630,000	1,630,000
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value	0	0
Business Combination, Contingent Consideration, Liability, Current		0
Business Combination, Contingent Consideration, Liability, Noncurrent		0
Financial Liabilities Fair Value Disclosure		0
Level 2 \| Cash and Cash Equivalents \| Cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value	0	0
Level 2 \| Investment [Domain] \| Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value	0
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value	1,755,000	9,965,000
Business Combination, Contingent Consideration, Liability, Current		4,800,000
Simple Agreements for Future Equity		2,106,000
Financial Liabilities Fair Value Disclosure		6,906,000
Level 3 \| Cash and Cash Equivalents \| Cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value	0	0
Level 3 \| Restricted cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets fair value	$ 0	$ 0

Cash Equivalents, and Marketable Securities Amortized Cost

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- Definition

Simple Agreements for Future Equity (SAFE Notes)

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765

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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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