Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Total	Convertible Notes - PIPE Investors [Member]	Redeemable Convertible Preferred Stock [Member]	Previously Reported [Member]	Retroactive Application of Business Combination	Preferred Stock [Member] Previously Reported [Member] Redeemable Convertible Preferred Stock [Member]	Preferred Stock [Member] Retroactive Application of Business Combination Redeemable Convertible Preferred Stock [Member]	Common Stock	Common Stock Convertible Notes - PIPE Investors [Member]	Common Stock Previously Reported [Member]	Common Stock Retroactive Application of Business Combination	Additional Paid-in Capital	Additional Paid-in Capital Convertible Notes - PIPE Investors [Member]	Additional Paid-in Capital Previously Reported [Member]	Additional Paid-in Capital Retroactive Application of Business Combination	Accumulated Deficit	Accumulated Deficit Previously Reported [Member]
Balance at Dec. 31, 2020	$ 79,965			$ (138,822)	$ 218,787			$ 10		$ 3	$ 7	$ 221,214		$ 2,434	$ 218,780	$ (141,259)	$ (141,259)
Balance (in Shares) at Dec. 31, 2020								96,284,283		3,252,636	93,031,647
Balance at Dec. 31, 2020						$ 218,787	$ (218,787)
Balance (in Shares) at Dec. 31, 2020						134,952,637	(134,952,637)
Vesting of restricted stock awards (in Shares)								7,271
Exercise of common stock options	6											6
Exercise of common stock options (in Shares)								24,582
Stock-based compensation expense	348											348
Net loss	(21,283)															(21,283)
Balance at Mar. 31, 2021	59,036							$ 10				221,568				(162,542)
Balance (in Shares) at Mar. 31, 2021								96,316,136
Balance at Dec. 31, 2021	(29,975)			$ (248,765)	$ 218,790			$ 10		$ 4	$ 6	223,584		$ 4,800	$ 218,784	(253,569)	$ (253,569)
Balance (in Shares) at Dec. 31, 2021								96,575,107		3,663,894	92,911,213
Balance at Dec. 31, 2021						$ 218,790	$ (218,790)
Balance (in Shares) at Dec. 31, 2021						134,972,944
Cashless exercise of Legacy GreenLight preferred stock warrants	460											460
Cashless exercise of Legacy GreenLight preferred stock warrants (in Shares)								490,031
Cashless exercise of Legacy GreenLight common stock warrants	1,183											1,183
Cashless exercise of Legacy GreenLight common stock warrants (in Shares)								170,981
Reclassification of Legacy GreenLight common stock warrants to equity	352											352
Conversion of convertible notes	18,291	$ 35,250						$ 1				18,290	$ 35,250
Conversion of convertible notes (in Shares)								6,719,116	3,525,000
Business Combination transaction, net of transaction costs of $26.7 million	72,989							$ 2				72,987
Business Combination transaction, net of transaction costs of $26.7 million (in Shares)								15,285,374
Vesting of restricted stock awards (in Shares)								1,567
Exercise of common stock options	22											22
Exercise of common stock options (in Shares)								79,055
Stock-based compensation expense	2,187											2,187
Exercise of public warrants	1,209											1,209
Exercise of public warrants (in Shares)								105,120
Other	65											79				(14)
Other (in Shares)								29,154
Net loss	(38,207)															(38,207)
Balance at Mar. 31, 2022	$ 63,826							$ 13				$ 355,603				$ (291,790)
Balance (in Shares) at Mar. 31, 2022								122,980,505
Balance (in Shares) at Mar. 31, 2022			0