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Stockholders' Equity - Summary of Common Stock Reserved for Future Issuance (Details) - shares	Dec. 31, 2021	Dec. 31, 2020
Stockholders Equity Note [Abstract]
Stock options outstanding	18,943,937	18,912,529
Restricted stock units outstanding	2,803,000
Stock options available for grant	869,000
Employee Stock Purchase Plan	201,000
Shares of common stock underlying convertible notes outstanding (see Note 8)	9,819,000
Total shares reserved for future issuance	32,636,000

X

- Definition

Aggregate number of convertible common shares reserved for future issuance.

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- Definition

Aggregate number of common shares reserved under employee stock purchase plan for future issuance.

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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
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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.

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

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