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Stockholders' Equity - At-the-Market Offering - Additional Information (Details) - USD ($)		1 Months Ended		12 Months Ended
	Aug. 18, 2020	Dec. 31, 2020	May 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Stockholders Equity Note [Line Items]
Gross proceeds from issuance of common stock				$ 230,000
Issuance costs		$ 1,861,000	$ 2,618,000	$ 1,000	$ 0
Cantor Fitzgerald & Co [Member]
Stockholders Equity Note [Line Items]
Percentage of commission on aggregate gross proceeds	3.00%
Cantor Fitzgerald & Co [Member] | At-the-Market Offering [Member]
Stockholders Equity Note [Line Items]
Shares issued in public offering				77,644
Gross proceeds from issuance of common stock				$ 910,000
Issuance costs				$ 44,000
Roth Capital Partners L L C
Stockholders Equity Note [Line Items]
Percentage of fee on gross sale price per share	1.05%
Percentage of underwriting fee to be received on company offerings	35.00%
Common stock offering period	90 days
Maximum [Member] | Cantor Fitzgerald & Co [Member]
Stockholders Equity Note [Line Items]
At-the-market offering, aggregate offering price	$ 10,000,000
Legal fees and disbursements	$ 50,000

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