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Stock-Based Compensation - Summary of Stock Option Activity (Details) - $ / shares	6 Months Ended
	Jun. 30, 2021
Number of Options Outstanding
Exercised (in shares)	(115,000)
Equity Incentive Plans, 2012, 2014, 2021
Number of Options Outstanding
Beginning balance (in shares)	19,373,000
Granted (in shares)	114,000
Exercised (in shares)	(7,132,000)
Forfeited/cancelled (in shares)	(125,000)
Ending balance (in shares)	12,230,000
Exercisable (in shares)	10,844,000
Weighted Average Exercise Price Per Share
Beginning balance, outstanding (in dollars per share)	$ 2.09
Granted (in dollars per share)	2.00
Exercised (in dollars per share)	1.73
Forfeited/Cancelled (in dollars per share)	3.96
Ending balance, outstanding (in dollars per share)	2.28
Exercisable (in dollars per share)	$ 2.01

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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.

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

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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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