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Balance Sheet Components (Tables)
 9 Months Ended
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Inventory, net
The components of inventory consisted of the following (in thousands):
 September 30,
2020		December 31, 2019
Raw materials$77,936 $67,829 
Work-in-progress28,127 21,207 
Finished goods25,848 20,570 
$131,911 $109,606 
Prepaid Expense and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in thousands):
 September 30,
2020		December 31, 2019
   
Government incentives receivable$762 $893 
Prepaid maintenance3,780 3,763 
Receivables from employees5,413 6,130 
Other prepaid expenses and other current assets20,285 17,282 
$30,240 $28,068 
Property, Plant and Equipment, Net
Property, plant and equipment, net, consisted of the following (in thousands):
 September 30,
2020		December 31, 2019
   
Energy Servers$657,418 $650,600 
Computers, software and hardware21,278 20,275 
Machinery and equipment105,652 101,650 
Furniture and fixtures8,334 8,339 
Leasehold improvements37,497 35,694 
Building46,686 40,512 
Construction in progress22,935 12,611 
899,800 869,681 
Less: Accumulated depreciation(297,871)(262,622)
$601,929 $607,059 
Customer Financing Leases, Receivable
The components of investment in sales-type financing leases consisted of the following (in thousands):
 September 30,
2020		December 31, 2019
Total minimum lease payments to be received$71,020 $76,886 
Less: Amounts representing estimated executory costs(18,164)(19,931)
Net present value of minimum lease payments to be received52,856 56,955 
Estimated residual value of leased assets890 890 
Less: Unearned income(1,680)(1,990)
Net investment in sales-type financing leases52,066 55,855 
Less: Current portion(5,341)(5,108)
Non-current portion of investment in sales-type financing leases$46,725 $50,747 
Schedule of Customer Payments from Sales-Type Financing Leases
The future scheduled customer payments from sales-type financing leases were as follows as of September 30, 2020 (in thousands):
 Remainder of 20202021202220232024Thereafter
Future minimum lease payments, less interest$1,319 $5,428 $5,784 $6,155 $6,567 $25,923 
Other Long-Term Assets
Other long-term assets consisted of the following (in thousands):
 September 30,
2020		December 31, 2019
   
Prepaid and other long-term assets$30,173 $29,153 
Deferred commissions6,524 5,007 
Equity-method investments2,040 5,733 
Long-term deposits1,895 1,759 
$40,632 $41,652 
Accrued Warranty
Accrued warranty liabilities consisted of the following (in thousands):
 September 30,
2020		December 31, 2019
   
Product warranty$2,951 $2,345 
Product performance6,749 7,535 
Maintenance services contracts107 453 
$9,807 $10,333 
Changes in the product warranty and product performance liabilities were as follows (in thousands):
Balances at December 31, 2019$9,881 
Accrued warranty, net 6,049 
Warranty expenditures during period (6,230)
Balances at September 30, 2020$9,700 
Accrued Other Current Liabilities
Accrued expenses and other current liabilities consisted of the following (in thousands):
 September 30,
2020		December 31, 2019
   
Compensation and benefits$18,908 $17,173 
Current portion of derivative liabilities4,949 4,834 
Sales related liabilities521 416 
Accrued installation13,212 10,348 
Sales tax liabilities1,880 3,849 
Interest payable2,841 3,875 
Accrued payables25,035 18,650 
Other10,536 11,139 
$77,882 $70,284 
Other Long-Term Liabilities
Other long-term liabilities consisted of the following (in thousands):
 September 30,
2020		December 31, 2019
Delaware grant$9,212 $10,469 
Other17,406 17,544 
$26,618 $28,013