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Subsequent Event - Additional Information (Details) - USD ($)				3 Months Ended			6 Months Ended
	Jul. 21, 2020	Jun. 22, 2020	Jun. 21, 2019	Jun. 28, 2020	Jun. 30, 2019	[1]	Jun. 28, 2020	Jun. 30, 2019
Subsequent Event [Line Items]
Net proceeds from issuance of common stock		$ 7,900,000	$ 8,000,000.0				$ 7,847,000	$ 8,548,000
Subsequent Event
Subsequent Event [Line Items]
Net proceeds from issuance of common stock	$ 461,000
Common Stock
Subsequent Event [Line Items]
Aggregate shares of common stock issued				2,500,000	1,314,000
Exercise of Option for Overallotment of Shares by Underwriters | Common Stock
Subsequent Event [Line Items]
Aggregate shares of common stock issued		375,000	171,429
Exercise of Option for Overallotment of Shares by Underwriters | Common Stock | Subsequent Event
Subsequent Event [Line Items]
Aggregate shares of common stock issued	141,733
[1] Common stock shares and additional paid-in capital amounts as of December 31, 2018, and in the three-months ended March 31, 2019 and June 30, 2019 are adjusted to reflect 1-for-14 reverse stock split effected on December 23, 2019.

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