Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 3,160,170	$ 1,312,404
Restricted cash	81,460	64,041
Available-for-sale securities, at fair value (amortized cost $1,244,618 and allowance for credit losses of $0 at June 30, 2021)	1,242,721
Equity securities	120,302
Accounts receivable	91,359	43,041
Inventory	209,820	139,386
Prepaid expenses and other current assets	60,579	44,324
Total current assets	4,966,411	1,603,196
Restricted cash	347,933	257,839
Property, plant, and equipment, net	110,475	74,549
Right of use assets related to finance leases, net	16,926	5,724
Right of use assets related to operating leases, net	145,803	117,016
Equipment related to power purchase agreements and fuel delivered to customers, net	78,918	75,807
Goodwill	72,083	72,387
Intangible assets, net	38,052	39,251
Other assets	12,225	5,513
Total assets	5,788,826	2,251,282
Current liabilities:
Accounts payable	70,027	50,198
Accrued expenses	35,405	46,083
Deferred revenue	27,004	23,275
Operating lease liabilities	19,915	14,314
Finance lease liabilities	2,728	903
Finance obligations	33,846	32,717
Current portion of long-term debt	30,403	25,389
Other current liabilities	31,750	29,487
Total current liabilities	251,078	222,366
Deferred revenue	45,272	32,944
Operating lease liabilities	122,203	99,624
Finance lease liabilities	12,380	4,493
Finance obligations	161,959	148,836
Convertible senior notes, net	192,011	85,640
Long-term debt	130,081	150,013
Other liabilities	42,973	40,447
Total liabilities	957,957	784,363
Stockholders' equity:
Common stock, $0.01 par value per share; 750,000,000 shares authorized; Issued (including shares in treasury): 586,848,225 at June 30, 2021 and 473,977,469 at December 31, 2020	5,868	4,740
Additional paid-in capital	6,962,720	3,446,650
Accumulated other comprehensive (loss) income	34	2,451
Accumulated deficit	(2,097,319)	(1,946,488)
Less common stock in treasury: 15,926,068 at both June 30, 2021 and December 31, 2020	(40,434)	(40,434)
Total stockholders' equity	4,830,869	1,466,919
Total liabilities and stockholders' equity	$ 5,788,826	$ 2,251,282