STOCKHOLDERS' EQUITY (Tables)

3 Months Ended

Mar. 31, 2021

STOCKHOLDERS' EQUITY

Schedule of Stock Options Activity

				Weighted-
				average
		Weighted-		contractual
	Number of	average		term	Aggregate
	shares	exercise price		(in years)	intrinsic value
Outstanding at December 31, 2020	2,526,166	$	6.99	8.10	$	115,472,832
Granted	—
Exercised	(31,245)		4.10
Forfeited	(4,525)		4.10
Expired	—		—
Outstanding at March 31, 2021	2,490,396	$	7.03	7.74	$	102,529,214

Schedule of Nonvested Restricted Stock Units Activity

		Weighted-average
		grant date fair
	Number of shares	value
Outstanding at December 31, 2020	10,785,034		13.38
Granted	893,488		51.77
Vested	(682,840)		13.81
Forfeited	(21,643)		22.98
Outstanding at March 31, 2021	10,974,039	$	16.46

Schedule of stock-based compensation expense

Stock-Based Compensation

The following table summarizes stock-based compensation expense information about restricted stock and stock options for the three months ended March 31, 2021 and 2020:

	Three months ended
	March 31,		March 31,
(in thousands)	2021		2020
Stock-based compensation expense associated with restricted stock	$	16,050	$	7,120
Stock-based compensation expense associated with option grants		568		3,948
Total	$	16,618	$	11,068