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FAIR VALUE MEASUREMENTS (Tables)
 6 Months Ended
Jun. 30, 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:
June 30, 2022
(in thousands)
Carrying
Amount
Fair ValueLevel 1Level 2Level 3
Financial assets:
Cash and cash equivalents$664,457 $664,457 $664,457 $— $— 
Short-term investments$599,666 $599,666 $599,666 $— $— 
Restricted cash$1,129 $1,129 $1,129 $— $— 
Financial liabilities:
Convertible Notes$676,683 $681,120 $681,120 $— $— 
Equipment notes$8,369 $7,871 $— $7,871 $— 
December 31, 2021
(in thousands)
Carrying
Amount
Fair Value
Level 1Level 2Level 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 $— 
Fair Value, Assets Measured on Recurring Basis The carrying amounts and estimated fair values by input level of the Company’s financial instruments were as follows:
June 30, 2022
(in thousands)
Carrying
Amount
Fair ValueLevel 1Level 2Level 3
Financial assets:
Cash and cash equivalents$664,457 $664,457 $664,457 $— $— 
Short-term investments$599,666 $599,666 $599,666 $— $— 
Restricted cash$1,129 $1,129 $1,129 $— $— 
Financial liabilities:
Convertible Notes$676,683 $681,120 $681,120 $— $— 
Equipment notes$8,369 $7,871 $— $7,871 $— 
December 31, 2021
(in thousands)
Carrying
Amount
Fair Value
Level 1Level 2Level 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 $—