STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	(Accumulated Deficit) Retained Earnings	Common Class A [Member]	Common Class B [Member]
Beginning Balance, Shares		153,052,983			0	0
Ending Balance, Shares		153,052,983			0	0
Beginning Balance at Dec. 31, 2019	$ 38,814	$ 15	$ 61,070	$ (22,271)	$ 0	$ 0
Stock-based compensation	50		50
Net income (loss)	4,134			4,134
Ending Balance at Mar. 31, 2020	42,998	15	61,120	(18,137)	0	0
Beginning Balance at Dec. 31, 2019	38,814	15	61,070	(22,271)	0	0
Stock-based compensation			236
Ending Balance at Jun. 30, 2020	57,409	15	61,356	(3,962)	0	0
Beginning Balance at Dec. 31, 2019	38,814	15	61,070	(22,271)	0	0
Net income (loss)	37,632
Ending Balance at Sep. 30, 2020	77,460	$ 15	62,084	15,361	$ 0
Beginning Balance, Shares		153,052,983			0	0
Ending Balance, Shares		153,052,983			0	0
Beginning Balance at Mar. 31, 2020	42,998	$ 15	61,120	(18,137)	$ 0	$ 0
Stock-based compensation	236
Net income (loss)	14,175			14,175
Ending Balance at Jun. 30, 2020	57,409	$ 15	61,356	(3,962)	$ 0	$ 0
Beginning Balance, Shares		153,052,983			0	0
Ending Balance, Shares		153,052,983			0	0
Stock-based compensation	693		693
Stock option exercises	35		35
Stock option exercises, Shares		76,482
Net income (loss)	19,323			19,323
Ending Balance at Sep. 30, 2020	77,460	$ 15	62,084	15,361	$ 0
Beginning Balance, Shares		153,129,465			0	0
Ending Balance, Shares		153,129,465			0	0
Beginning Balance, Shares		154,444,851			0	0
Ending Balance, Shares		154,444,851			0	0
Beginning Balance at Dec. 31, 2020	97,677	$ 15	70,175	27,487	$ 0	$ 0
Stock-based compensation	5,015		5,015
Stock option exercises	123		123
Stock option exercises, Shares		204,309
Net income (loss)	11,440			11,440
Ending Balance at Mar. 31, 2021	114,255	$ 15	75,313	38,927	0	0
Beginning Balance at Dec. 31, 2020	$ 97,677	15	70,175	27,487	0	0
Stock option exercises, Shares	3,250,013
Net income (loss)	$ (22,152)
Ending Balance at Sep. 30, 2021	219,299	$ 0	213,948	5,335	$ 15	$ 1
Beginning Balance, Shares		154,649,160			0	0
Ending Balance, Shares		154,649,160			0	0
Beginning Balance at Mar. 31, 2021	114,255	$ 15	75,313	38,927	$ 0	$ 0
Stock-based compensation	56,012		56,012
Stock option exercises	449		449
Stock option exercises, Shares		350,721			94,810
Net income (loss)	(40,546)			(40,546)
Issuance of Class A Common Stock upon exchange of Common Stock		$ (14)			$ 14
Issuance of Class A Common Stock upon exchange of Common Stock, Shares		(142,851,852)			142,851,852
Issuance of Class B Common Stock upon exchange of Common Stock		$ (1)				$ 1
Issuance of Class B Common Stock upon exchange of Common Stock, Shares		(12,148,029)				12,148,029
Issuance of Class A Common Stock upon initial public offering, net of offering costs	95,101		95,100
Issuance of Class A Common Stock upon initial public offering, net of offering costs, shares					4,636,364	1,116,030
Issuance of Class A Common Stock upon vesting of Restricted Stock, net of tax withholdings, Shares					1,166,538
Issuance of Class B Common Stock Upon Exchange Of Class A Restricted Stock					(1,116,030)
Restricted Stock Surrendered For Employees Tax Liability	(21,556)		(21,556)
Ending Balance at Jun. 30, 2021	203,715	$ 0	205,318	(1,619)	$ 15	$ 1
Beginning Balance, Shares		0			147,633,534	13,264,059
Ending Balance, Shares		0			147,633,534	13,264,059
Stock-based compensation	7,253		7,253
Stock option exercises	76		76
Stock option exercises, Shares					2,548,502
Net income (loss)	6,954			6,954
Issuance of Class A Common Stock upon vesting of Restricted Stock, net of tax withholdings, Shares					1,427
Issuance of Class A Common Stock upon exchange of Class B Common Stock					1,468,324	(1,468,324)
Capital Contribution	1,301		1,301
Ending Balance at Sep. 30, 2021	$ 219,299	$ 0	$ 213,948	$ 5,335	$ 15	$ 1
Beginning Balance, Shares		0			151,651,787	11,795,735
Ending Balance, Shares		0			151,651,787	11,795,735