Stock-Based Compensation - Summary of Stock Option Activity (Details)	3 Months Ended
Mar. 31, 2021 $ / shares shares
Number of Shares
Balances at December 31, 2020 \| shares	7,475,472
Granted \| shares	1,044,000
Exercised \| shares	(259,019)
Canceled \| shares	(854,834)
Balances at March 31, 2021 \| shares	7,405,619
Weighted-Average Exercise Price
Balances at December 31, 2020 \| $ / shares	$ 6.88
Granted \| $ / shares	6.59
Exercised \| $ / shares	4.57
Canceled \| $ / shares	9.29
Balances at March 31, 2021 \| $ / shares	$ 6.64

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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