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WARRANTS (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended		6 Months Ended
	Apr. 28, 2021	Apr. 07, 2021	Aug. 20, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jul. 25, 2021
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)	50,207,439
Conversion of securities into common stock (in shares)	2,759,970
Loss from fair value adjustment	$ 100,900			$ (67,179)	$ (1,918)	$ (133,577)	$ (909)
Conversion of securities into common stock	$ 60,600
Sale of stock, number of shares Issued in transaction (in shares)						22,500,000
Number of shares called from each warrant (in shares)			1
Exercise Price (in dollars per share)		$ 0.01
Number of shares called from exchange of warrants (in shares)		350,000
Warrants and rights outstanding				304,300		$ 304,300
Issuance of common stock warrants for services (Note 8)		$ 9,200		$ 9,183
Legacy Stem Warrants
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)				23,634		23,634
Public Warrants
Class of Warrant or Right [Line Items]
Sale of stock, number of shares Issued in transaction (in shares)			12,786,168
Exercise Price (in dollars per share)			$ 11.50
Warrants and rights outstanding				$ 185,900		$ 185,900
Private Warrants
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)				0		0
Loss from fair value adjustment						$ 52,000
Number of shares called from exchange of warrants (in shares)				7,181,134		7,181,134
Warrants and rights outstanding				$ 118,400		$ 118,400
Private Warrants | Subsequent Event
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)								7,181,134
Number of shares called from exchange of warrants (in shares)								4,683,349

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Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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