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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fair Value Of Financial Instruments [Line Items]
Cash and cash equivalents	$ 29,906,000	$ 71,157,000
Restricted cash	316,000	527,000
Short-term investments	$ 19,978,000
Fair value of note payable to related party, description	The fair value measurement of debt instruments is based on a discounted cash flow model and is sensitive to the change in yield (Level 3 in the fair value hierarchy
Embedded derivatives	$ 0
Money Market Funds
Fair Value Of Financial Instruments [Line Items]
Cash and cash equivalents	29,900,000	71,200,000
Restricted cash	300,000	500,000
U.S. Treasury bills or notes.
Fair Value Of Financial Instruments [Line Items]
Short-term investments	$ 20,000,000	$ 0

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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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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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