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Basis of Presentation and Summary of Significant Accounting Policies - Net Loss per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Options
Impairment Effects on Earnings Per Share [Line Items]
Securities excluded from net loss per share calculation (less than for options in the three months ended June 30, 2020) (in shares)	57,000	35,000	69,000	1,000
Restricted share units
Impairment Effects on Earnings Per Share [Line Items]
Securities excluded from net loss per share calculation (less than for options in the three months ended June 30, 2020) (in shares)	9,000	7,000	3,000	4,000
Warrants
Impairment Effects on Earnings Per Share [Line Items]
Securities excluded from net loss per share calculation (less than for options in the three months ended June 30, 2020) (in shares)	49,000	53,000	77,000	0
Convertible securities
Impairment Effects on Earnings Per Share [Line Items]
Securities excluded from net loss per share calculation (less than for options in the three months ended June 30, 2020) (in shares)	175,000	533,000	346,000	506,000

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=124432515&loc=d3e3550-109257

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+ References

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