Customer Deposits - Summary of Customer Deposits (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Deposit Liabilities Disclosure [Line Items]
Customer deposits	$ 4,823	$ 3,527
Customer reservation deposits [Member]
Deposit Liabilities Disclosure [Line Items]
Customer deposits	4,069	2,773
Customer SUV option [Member]
Deposit Liabilities Disclosure [Line Items]
Customer deposits	$ 754	$ 754

The noncurrent portion of money or property received from customers that is to be returned upon satisfactory contract completion or as partial prepayment for goods or services to be provided in the future.

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_CustomerDepositsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant