Unaudited Condensed Consolidated Statements of Changes in Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Total
Balance at Dec. 31, 2019	$ 8	$ 53,887	$ (67,595)	$ (13,700)
Balance (in Shares) at Dec. 31, 2019	80,400,727
Exercise of warrants		34		34
Exercise of warrants (in Shares)	2,584,637
Exercise of stock options
Exercise of stock options (in Shares)	5,300
Stock-based compensation expense		52		52
Net income (loss)			(6,454)	(6,454)
Balance at Mar. 31, 2020	$ 8	53,973	(74,049)	(20,068)
Balance (in Shares) at Mar. 31, 2020	82,990,664
Stock-based compensation expense		225		225
Net income (loss)			(13,499)	(13,499)
Balance at Jun. 30, 2020	$ 8	54,198	(87,548)	(33,342)
Balance (in Shares) at Jun. 30, 2020	82,990,664
Exercise of warrants		850		850
Exercise of warrants (in Shares)	1,064,524
Exercise of stock options		21		21
Exercise of stock options (in Shares)	85,705
Stock-based compensation expense		386		386
Net income (loss)			(2,277)	(2,277)
Balance at Sep. 30, 2020	$ 8	55,455	(89,825)	(34,362)
Balance (in Shares) at Sep. 30, 2020	84,140,893
Balance at Dec. 31, 2020	$ 13	317,084	(128,201)	188,896
Balance (in Shares) at Dec. 31, 2020	131,365,254
Exercise of warrants
Exercise of warrants (in Shares)	233,555
Exercise of Public warrants	$ 1	85,554		85,555
Exercise of Public warrants (in Shares)	7,441,020
Settlement of warrant liability upon exercise of warrants		47,162		47,162
Settlement of warrant liability upon call of warrants		591		591
Proceeds from PIC shares recapitalization		75		75
Exercise of stock options		16		16
Exercise of stock options (in Shares)	65,875
Stock-based compensation expense		442		442
Net income (loss)			61,914	61,914
Balance at Mar. 31, 2021	$ 14	450,924	(66,287)	384,651
Balance (in Shares) at Mar. 31, 2021	139,105,704
Exercise of stock options		7		7
Exercise of stock options (in Shares)	29,870
Issuance of shares in business combination with World Energy		1,439		1,439
Issuance of shares in business combination with World Energy (in Shares)	231,002
Stock-based compensation expense		754		754
Net income (loss)			(10,469)	(10,469)
Balance at Jun. 30, 2021	$ 14	453,124	(76,756)	376,382
Balance (in Shares) at Jun. 30, 2021	139,366,576
Exercise of stock options		9		9
Exercise of stock options (in Shares)	37,338
Stock-based compensation expense		1,194		1,194
Net income (loss)			(7,531)	(7,531)
Balance at Sep. 30, 2021	$ 14	$ 454,327	$ (84,287)	$ 370,054
Balance (in Shares) at Sep. 30, 2021	139,403,914