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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Stock-based Compensation Recorded in Consolidated Statements of Operations and Comprehensive Loss

Total stock-based compensation recorded in the consolidated statements of operations and comprehensive loss during the years ended December 31, 2021 and 2020 consisted of the following:

		Years Ended December 31,
		2021				2020
Cost of revenues		$	10,996			$	1,400
Research and development			9,973				1,183
Selling, general and administrative			11,588				1,635
Total stock-based compensation expense		$	32,557			$	4,218

Summary of Stock Option Activity

The following summarizes the stock option activity of the 2013 Plan for the years ended December 31, 2021 and 2020:

		Options to Purchase Common Stock				Weighted- Average Exercise Price per Share				Weighted- Average Grant Date Fair Value per Share				Weighted- Average Remaining Contract Life (In Years)				Aggregate Intrinsic Value
Outstanding — at January 1, 2020			27,263,775			$	0.97			$	0.50				7.95			$	11,941
Granted			90,597				1.41				0.78
Exercised			(2,771,051	)			0.36								3.21				2,565
Forfeited			(1,508,243	)			1.26
Expired			(986,352	)			1.05
Outstanding — at December 31, 2020			22,088,726			$	1.03			$	0.53				7.12			$	85,853
Granted			—				—				—				—				—
Exercised			(3,708,786	)			1.00				0.51				4.32				41,822
Forfeited			(857,579	)			1.21				0.60				0.01				9,131
Expired			(177,033	)			1.16				0.31				—				1,969
Outstanding — at December 31, 2021			17,345,328			$	1.03			$	0.54				6.03			$	195,111
Options vested and exercisable — at December 31, 2021			15,112,440			$	1.01			$	0.52				5.90			$	170,320
Options vested and exercisable — at December 31, 2020			14,739,214			$	0.97			$	0.49				6.83			$	57,660

Summary of Weighted-average Assumptions

The following weighted-average assumptions were used in the Black-Sholes option-pricing model calculation for stock options granted for the years ended December 31, 2021 and 2020:

		2021				2020
Fair value per share of common stock		$	—			$	1.41
Expected volatility			—	%			60.0	%
Risk-free interest rate			—	%			0.6	%
Expected life (years)			—				6.25
Dividend rate			None				None

Summary of Performance-based Restricted Stock Unit Activity

The following summarizes the performance-based restricted stock unit activity of the Plan for the years ended December 31, 2021 and 2020:

		Number of Units				Weighted- Average Grant Date Fair Value
Outstanding — at January 1, 2020			6,818,453			$	1.41
Granted			5,954,361				1.25
Forfeited			(941,759	)			1.40
Outstanding — at December 31, 2020			11,831,055				1.33
Granted			6,542,426				9.68
Forfeited			(1,426,559	)			2.10
Outstanding — at December 31, 2021			16,946,922			$	4.49
Units expected to vest — at December 31, 2021			16,946,922			$	4.49
Units expected to vest — at December 31, 2020			—			$	—

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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