CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities:
Net loss	$ (102,385)	$ (57,341)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Loss on early extinguishment of debt	431
Depreciation and amortization, net of amortization of deferred grants	32,673	22,493
Bad debt expense	739	124
Interest on lease pass-through financing	7,177	4,006
Noncash tax benefit	(6,215)	(10,043)
Noncash interest expense	4,443	1,185
Stock—based compensation expense	6,421	4,310
Reduction in lease pass—through financing obligations	(10,379)	(4,890)
Changes in operating assets and liabilities:
Accounts receivable	(4,216)	(740)
Inventories	(13,890)	2,993
Prepaid and other assets	(8,615)	52
Accounts payable	22,751	6,895
Accrued expenses and other liabilities	6,209	710
Deferred revenue	20,254	40,305
Net cash provided by (used in) operating activities	(44,602)	10,059
Investing activities:
Payments for the costs of solar energy systems, leased and to be leased	(257,806)	(178,741)
Purchases of property and equipment	(4,688)	(3,712)
Acquisitions of businesses, net of cash acquired	(14,575)	(36,384)
Net cash used in investing activities	(277,069)	(218,837)
Financing activities:
Proceeds from grants and state tax credits	5,120	107
Proceeds from issuance of debt	153,200	13,546
Repayment of debt	(54,956)	(2,017)
Payment of debt fees	(2,801)	(225)
Proceeds from issuance of convertible preferred stock, net of issuance costs		143,393
Proceeds from lease pass-through financing obligations	52,034	90,387
Contributions received from noncontrolling interests and redeemable noncontrolling interests	155,662	88,000
Distributions paid to noncontrolling interests and redeemable noncontrolling interests	(13,717)	(20,908)
Proceeds from exercises of stock options	2,387	1,116
Payment of capital lease obligation	(1,472)	(502)
Payments for deferred offering costs	(4,722)
Change in restricted cash	(4,608)	84
Net cash provided by financing activities	286,127	312,981
Net increase (decrease) in cash and cash equivalents	(35,544)	104,203
Cash and cash equivalents, beginning of period	152,154	99,699
Cash and cash equivalents, end of period	116,610	203,902
Supplemental disclosures of cash flow information
Cash paid for interest	3,118	6,460
Supplemental disclosures of noncash investing and financing activities
Costs of solar energy systems included in accounts payable	4,777	191
Distributions payable to noncontrolling interests and redeemable noncontrolling interests	6,463	5,281
Vehicles acquired under capital leases	5,255	1,051
Noncash purchase consideration on acquisition of business	$ 18,718	$ 76,964