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Supplemental Information - Summary of Statements of Certain Statements of Cash Flows Amounts (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Cash and cash equivalents	$ 16,386	$ 17,299	$ 7,385
Restricted cash	393		388
Non-current restricted cash	597	597	1,045
Total cash, cash equivalents, and restricted cash	17,376	18,289	8,818	$ 60,038
Short-term investments	3,045	$ 11,698	38,620
Total	$ 20,421		$ 47,438

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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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