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Restatement of Previously Issued Consolidated Financial Statements - Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current assets:                      
Cash and cash equivalents $ 1,312,404 $ 448,140 $ 152,492 $ 74,340 $ 139,496 $ 43,275 $ 19,845 $ 39,336      
Restricted cash 64,041 55,704 50,634 56,804 54,813 35,720 19,400 19,297      
Accounts receivable 43,041 113,505 45,782 24,734 25,768 24,737 26,844 32,307      
Inventory 139,386 134,203 114,571 92,972 72,391 80,601 73,190 65,474      
Prepaid expenses and other current assets 44,324 26,731 31,436 28,500 21,192 12,804 14,001 10,296      
Total current assets 1,603,196 778,283 394,915 277,350 313,660 197,137 153,280 166,710      
Restricted cash 257,839 227,528 180,127 176,070 175,191 119,322 96,082 50,598      
Property, plant, and equipment, net 74,549 64,820 60,018 16,591 14,959 14,990 14,228 13,615      
Right of use assets related to finance leases, net 5,724 2,335 2,389 1,707 1,714 1,720 1,726 1,733      
Right of use assets related to operating leases 117,016 90,184 71,789 64,812 63,266 47,016 39,679 33,599      
Equipment related to power purchase agreements and fuel delivered to customers, net 75,807 71,891 68,428 68,402 67,769 67,248 68,982 70,928      
Goodwill 72,387 71,822 70,262 8,673 8,842 8,606 8,961 8,886      
Intangible assets, net 39,251 39,569 38,974 5,696 5,539 5,113 5,398 3,677      
Other assets 5,513 9,661 11,817 12,059 8,573 9,152 8,842 11,069      
Total assets 2,251,282 1,356,093 898,719 631,360 659,513 470,304 397,178 360,815      
Current liabilities:                      
Accounts payable 50,198 58,793 39,812 35,503 40,376 36,851 36,946 31,688      
Accrued expenses 46,083 37,948 23,917 14,870 14,409 9,457 4,522 6,509      
Deferred revenue. 23,275 17,226 14,902 11,557 11,691 11,480 11,730 11,736      
Operating lease liabilities 14,314 10,609 9,453 8,959 9,428 8,666 7,512 7,042      
Finance lease liabilities 903 374 345 204 226 310 266 236      
Finance obligations 32,717 31,349 28,794 26,209 24,667 20,469 12,455 11,028      
Current portion of long-term debt 25,389 74,829 50,933 27,819 26,461 17,202 15,928 12,559      
Other current liabilities 29,487 21,083 19,418 8,446 6,704 8,373 3,705 3,745      
Total current liabilities 222,366 252,211 187,574 133,567 133,962 112,808 93,064 84,543      
Deferred revenue 32,944 29,511 24,848 22,684 23,170 22,213 24,126 25,366      
Operating lease liabilities 99,624 74,422 58,410 52,165 50,937 36,599 30,631 25,657      
Finance lease liabilities 4,493 2,384 2,465 1,953 2,011 2,068 2,123 2,142      
Finance obligations 148,836 140,662 131,653 121,322 119,422 99,669 76,916 54,864      
Common stock warrant liability           98 525 2,231      
Convertible senior notes, net 85,640 105,088 142,889 113,063 110,431 107,945 66,844 65,025      
Long-term debt 150,013 120,380 101,844 79,119 85,708 78,840 83,776 72,676      
Other liabilities 40,447 45,170 14,476 2,386 2,818 2,834 3,333 3,746      
Total liabilities 784,363 769,828 664,159 526,259 528,459 463,074 381,338 336,250      
Stockholders' equity:                      
Common stock, $.01 par value 4,740 4,061 3,482 3,222 3,186 2,540 2,470 2,445      
Additional paid-in capital 3,446,650 2,083,169 1,658,438 1,519,094 1,506,953 1,340,781 1,325,381 1,316,815      
Accumulated other comprehensive income 2,451 1,846 1,159 1,052 1,288 929 1,460 1,374      
Accumulated deficit (1,946,488) (1,462,377) (1,397,160) (1,387,752) (1,350,307) (1,332,259) (1,314,425) (1,297,072)      
Less common stock in treasury (40,434) (40,434) (31,359) (31,224) (31,216) (31,216) (30,681) (30,637)      
Total stockholders' equity 1,466,919 586,265 234,560 104,392 129,904 (19,225) (15,795) (7,075) $ (3,588) $ 70,229  
Total liabilities, redeemable preferred stock, and stockholders' equity $ 2,251,282 1,356,093 898,719 631,360 659,513 470,304 397,178 360,815      
Series C Redeemable Convertible Preferred Stock                      
Redeemable preferred stock:                      
Preferred stock       709 709 709 709 709      
Series E Redeemable Convertible Preferred Stock                      
Redeemable preferred stock:                      
Preferred stock         441 25,746 30,926 30,931      
As previously Reported                      
Current assets:                      
Cash and cash equivalents   448,140 152,492 74,340 139,496 43,275 19,845 39,336      
Restricted cash   55,704 50,634 56,804 54,813 35,720 19,400 19,297      
Accounts receivable   113,133 45,522 24,437 25,448 24,392 26,592 32,062      
Inventory   134,306 114,571 92,972 72,391 80,601 73,190 65,474      
Prepaid expenses and other current assets   26,731 31,436 28,500 21,192 12,804 14,001 10,296      
Total current assets   778,014 394,655 277,053 313,340 196,792 153,028 166,465      
Restricted cash   227,528 180,127 176,070 175,191 119,322 96,082 50,598      
Property, plant, and equipment, net   64,820 60,018 16,591 14,959 14,990 14,228 13,615      
Equipment related to power purchase agreements and fuel delivered to customers, net   309,475 274,721 252,802 244,740 202,034 170,455 141,889      
Goodwill   71,962 70,402 8,673 8,842 8,606 8,961 8,886      
Intangible assets, net   39,169 38,574 5,296 5,539 5,113 5,398 3,677      
Other assets   9,661 11,817 12,059 8,573 9,152 8,842 11,069      
Total assets   1,500,629 1,030,314 748,544 771,184 556,009 456,994 396,199      
Current liabilities:                      
Accounts payable   58,793 39,812 35,503 40,376 36,851 36,946 31,688      
Accrued expenses   32,031 23,320 14,273 14,213 9,457 4,522 6,509      
Deferred revenue.   17,226 14,902 11,557 11,691 11,480 11,730 11,736      
Finance obligations   63,692 57,695 52,047 49,507 41,112 30,663 23,997      
Current portion of long-term debt   74,829 50,933 27,819 26,461 17,202 15,928 12,559      
Other current liabilities   17,280 21,692 10,423 8,543 10,238 3,017 2,271      
Total current liabilities   263,851 208,354 151,622 150,791 126,340 102,806 88,760      
Deferred revenue   29,648 25,038 22,912 23,369 22,444 24,519 25,835      
Finance obligations   337,150 300,653 272,171 265,228 208,465 157,531 111,195      
Common stock warrant liability           98 525 2,231      
Convertible senior notes, net   105,088 142,704 112,878 110,246 107,760 66,844 65,025      
Long-term debt   120,380 101,844 79,119 85,708 78,840 83,776 72,676      
Other liabilities   27,068 11,756 13 13 13 13 17      
Total liabilities   883,185 790,349 638,715 635,355 543,960 436,014 365,739      
Stockholders' equity:                      
Common stock, $.01 par value   4,061 3,482 3,222 3,186 2,540 2,470 2,445      
Additional paid-in capital   2,083,199 1,658,532 1,519,257 1,507,116 1,340,859 1,325,459 1,316,893      
Accumulated other comprehensive income   1,958 1,271 1,164 1,400 929 1,460 1,374      
Accumulated deficit   (1,431,340) (1,391,961) (1,383,299) (1,345,807) (1,327,518) (1,309,363) (1,291,255)      
Less common stock in treasury   (40,434) (31,359) (31,224) (31,216) (31,216) (30,681) (30,637)      
Total stockholders' equity   617,444 239,965 109,120 134,679 (14,406) (10,655) (1,180) 134,679 2,713 $ 73,646
Total liabilities, redeemable preferred stock, and stockholders' equity   1,500,629 1,030,314 748,544 771,184 556,009 456,994 396,199      
As previously Reported | Series C Redeemable Convertible Preferred Stock                      
Redeemable preferred stock:                      
Preferred stock       709 709 709 709 709      
As previously Reported | Series E Redeemable Convertible Preferred Stock                      
Redeemable preferred stock:                      
Preferred stock         441 25,746 30,926 30,931      
Restatement Adjustments                      
Current assets:                      
Accounts receivable   372 260 297 320 345 252 245      
Inventory   (103)                  
Total current assets   269 260 297 320 345 252 245      
Right of use assets related to finance leases, net   2,335 2,389 1,707 1,714 1,720 1,726 1,733      
Right of use assets related to operating leases   90,184 71,789 64,812 63,266 47,016 39,679 33,599      
Equipment related to power purchase agreements and fuel delivered to customers, net   (237,584) (206,293) (184,400) (176,971) (134,786) (101,473) (70,961)      
Goodwill   (140) (140)                
Intangible assets, net   400 400 400              
Total assets   (144,536) (131,595) (117,184) (111,671) (85,705) (59,816) (35,384)      
Current liabilities:                      
Accrued expenses   5,917 597 597 196            
Operating lease liabilities   10,609 9,453 8,959 9,428 8,666 7,512 7,042      
Finance lease liabilities   374 345 204 226 310 266 236      
Finance obligations   (32,343) (28,901) (25,838) (24,840) (20,643) (18,208) (12,969)      
Other current liabilities   3,803 (2,274) (1,977) (1,839) (1,865) 688 1,474      
Total current liabilities   (11,640) (20,780) (18,055) (16,829) (13,532) (9,742) (4,217)      
Deferred revenue   (137) (190) (228) (199) (231) (393) (469)      
Operating lease liabilities   74,422 58,410 52,165 50,937 36,599 30,631 25,657      
Finance lease liabilities   2,384 2,465 1,953 2,011 2,068 2,123 2,142      
Finance obligations   (196,488) (169,000) (150,849) (145,806) (108,796) (80,615) (56,331)      
Convertible senior notes, net     185 185 185 185          
Other liabilities   18,102 2,720 2,373 2,805 2,821 3,320 3,729      
Total liabilities   (113,357) (126,190) (112,456) (106,896) (80,886) (54,676) (29,489)      
Stockholders' equity:                      
Additional paid-in capital   (30) (94) (163) (163) (78) (78) (78)      
Accumulated other comprehensive income   (112) (112) (112) (112)            
Accumulated deficit   (31,037) (5,199) (4,453) (4,500) (4,741) (5,062) (5,817)      
Total stockholders' equity   (31,179) (5,405) (4,728) (4,775) (4,819) (5,140) (5,895) (6,301) $ (3,417)  
Total liabilities, redeemable preferred stock, and stockholders' equity   (144,536) (131,595) (117,184) (111,671) (85,705) (59,816) (35,384)      
Other Adjustments                      
Current assets:                      
Accounts receivable   372 260 297 320 345 252 245      
Inventory   103                  
Goodwill   140 (140)                
Intangible assets, net   400 400 400              
Current liabilities:                      
Accrued expenses   703 597 597 196            
Deferred revenue   137 (190) (228) 199 (231) (393) (469)      
Convertible senior notes, net     185 185 185 185          
Stockholders' equity:                      
Additional paid-in capital   30 (94) (163) 163 $ 78 $ (78) $ (78) $ 78    
Accumulated other comprehensive income   $ 112 $ (112) $ (112) $ 112