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Fair Value Measurements - Summary of Company's Fair Value Hierarchy for its Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Fair value of investments	$ 255	$ 54,825
Liabilities:
Fair value of liabilities	(4,196)
Corporate Obligations [Member]
Assets:
Fair value of investments		52,540
Contingent Purchase Price [Member]
Liabilities:
Fair value of liabilities	(4,196)
Federal Agency Obligations [Member]
Assets:
Fair value of investments		1,793
Money Market Funds [Member]
Assets:
Fair value of cash equivalents	255	492
Level 1 [Member]
Assets:
Fair value of investments	255	492
Level 1 [Member] | Money Market Funds [Member]
Assets:
Fair value of cash equivalents	255	492
Level 2 [Member]
Assets:
Fair value of investments		54,333
Level 2 [Member] | Corporate Obligations [Member]
Assets:
Fair value of investments		52,540
Level 2 [Member] | Federal Agency Obligations [Member]
Assets:
Fair value of investments		$ 1,793
Level 3 [Member]
Liabilities:
Fair value of liabilities	(4,196)
Level 3 [Member] | Contingent Purchase Price [Member]
Liabilities:
Fair value of liabilities	$ (4,196)

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Fair value portion 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.

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- Definition

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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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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