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STOCKHOLDERS' EQUITY - COMMON STOCK RESERVED FOR FUTURE ISSUANCE (Details) - shares	Dec. 31, 2019	Dec. 31, 2018
STOCKHOLDERS' EQUITY
Outstanding stock options (in shares)	37,614,013	27,285,952
Options and awards available for grant (in shares)	6,407,355	11,964,399
Warrant outstanding (in shares)	537,893
Common stock reserved for future issuance (in shares)	45,395,620
Employee Stock
STOCKHOLDERS' EQUITY
Common stock reserved for future issuance (in shares)	836,359

X

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Number of options outstanding, including both vested and non-vested options.

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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