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FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2022

Fair Value Disclosures [Abstract]

Fair Value Disclosure of Asset and Liability Not Measured at Fair Value

The carrying amounts and estimated fair values by input level of the Company’s financial instruments were as follows:

			December 31, 2022
(in thousands)			Carrying Amount						Fair Value						Level 1						Level 2						Level 3
Financial assets:
Cash and cash equivalents			$	136,627					$	136,627					$	136,627					$	—					$	—
Short-term investments			$	1,045,718					$	1,045,718					$	1,045,718					$	—					$	—
Restricted cash			$	6,882					$	6,882					$	6,882					$	—					$	—
Financial liabilities:
Convertible Notes			$	678,444					$	610,650					$	610,650					$	—					$	—
Equipment notes			$	7,135					$	6,807					$	—					$	6,807					$	—

			December 31, 2021
(in thousands)			Carrying Amount						Fair Value						Level 1						Level 2						Level 3
Financial assets:
Cash and cash equivalents			$	1,179,297					$	1,179,297					$	1,179,297					$	—					$	—
Restricted cash			$	1,860					$	1,860					$	1,860					$	—					$	—
Financial liabilities:
Convertible Notes			$	674,927					$	880,026					$	880,026					$	—					$	—
Offtake Advances			$	16,082					$	16,501					$	—					$	—					$	16,501
Equipment notes			$	9,661					$	9,737					$	—					$	9,737					$	—

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The carrying amounts and estimated fair values by input level of the Company’s financial instruments were as follows:

			December 31, 2022
(in thousands)			Carrying Amount						Fair Value						Level 1						Level 2						Level 3
Financial assets:
Cash and cash equivalents			$	136,627					$	136,627					$	136,627					$	—					$	—
Short-term investments			$	1,045,718					$	1,045,718					$	1,045,718					$	—					$	—
Restricted cash			$	6,882					$	6,882					$	6,882					$	—					$	—
Financial liabilities:
Convertible Notes			$	678,444					$	610,650					$	610,650					$	—					$	—
Equipment notes			$	7,135					$	6,807					$	—					$	6,807					$	—

			December 31, 2021
(in thousands)			Carrying Amount						Fair Value						Level 1						Level 2						Level 3
Financial assets:
Cash and cash equivalents			$	1,179,297					$	1,179,297					$	1,179,297					$	—					$	—
Restricted cash			$	1,860					$	1,860					$	1,860					$	—					$	—
Financial liabilities:
Convertible Notes			$	674,927					$	880,026					$	880,026					$	—					$	—
Offtake Advances			$	16,082					$	16,501					$	—					$	—					$	16,501
Equipment notes			$	9,661					$	9,737					$	—					$	9,737					$	—

X

- Definition

Tabular disclosure of information about fair value of asset and liability not measured at fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2E
-URI https://asc.fasb.org/extlink&oid=126976982&loc=SL7498357-110258

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X

- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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