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Summary of Significant Accounting Policies - Shares Excluded For EPS (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Shares excluded from the computation of diluted net loss per share
Common stock equivalents excluded from the computation of diluted net loss per share due to their anti-dilutive effect (in shares)	48,501,697	44,049,843
Shares excluded from the computation of diluted net loss per share	3,739,534	4,177,009
Stock options
Shares excluded from the computation of diluted net loss per share
Common stock equivalents excluded from the computation of diluted net loss per share due to their anti-dilutive effect (in shares)	781,404
Shares excluded from the computation of diluted net loss per share	3,641,903	4,058,347
Restricted stock units
Shares excluded from the computation of diluted net loss per share
Common stock equivalents excluded from the computation of diluted net loss per share due to their anti-dilutive effect (in shares)	82,591
Shares excluded from the computation of diluted net loss per share	97,631	118,662

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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1505-109256

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