Related Party Transactions - Additional Information (Detail)	12 Months Ended
Dec. 31, 2019 USD ($) shares
Related Party Transaction [Line Items]
Sale of common stock, description	The offering and private transaction, together the “Transactions”, closed on April 11, 2019.
Proceeds from sale of common stock \| $	$ 0
Public Offering [Member]
Related Party Transaction [Line Items]
Number of common stock sold by shareholders \| shares	4,300,000
Private Transaction [Member]
Related Party Transaction [Line Items]
Number of common stock sold by shareholders \| shares	1,750,000
Transactions [Member] \| Selling, General and Administrative Expense [Member]
Related Party Transaction [Line Items]
Costs and expenses \| $	$ 248,000

Description of stock transaction which may include details of the offering (IPO, private placement), a description of the stock sold, percentage of subsidiary's or equity investee's stock sold, a description of the investors and whether the stock was issued in a business combination.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569655-111683

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration