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Summary of Significant Accounting Policies - Net Loss Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Equity Option
Impairment Effects on Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (number of shares)	69,000	1,000
Restricted Stock Units (RSUs)
Impairment Effects on Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (number of shares)	4,000	27,000
Warrant
Impairment Effects on Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (number of shares)	174,000
Convertible Preferred Stock
Impairment Effects on Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (number of shares)	506,000	507,000

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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+ References

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