Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts		$ (2,228)	$ (1,665)
Preferred stock, par value		$ 0.0001	$ 0.0001
Preferred stock, shares authorized		200,000,000	200,000,000
Preferred stock, shares issued (in shares)		0	0
Preferred stock, shares outstanding (in shares)		0	0
Common stock, par value		$ 0.0001	$ 0.0001
Common stock, shares authorized		2,000,000,000	2,000,000,000
Common stock, shares issued		107,350,000	104,321,000
Common stock, shares outstanding (in shares)		107,350,000	104,321,000
Total assets	[1]	$ 4,749,787	$ 3,963,136
Solar energy systems, net		3,820,017	3,161,570
Cash		226,625	202,525
Restricted cash		77,626	39,265
Accounts receivable, net		66,435	60,359
Prepaid expenses and other current assets		8,563	9,202
Other assets		335,685	246,464
Total liabilities	[1]	3,340,703	2,598,819
Accounts payable		131,278	115,193
Distributions payable to noncontrolling interests and redeemable noncontrolling interests		15,847	13,583
Accrued expenses and other liabilities		98,636	97,230
Deferred revenue		591,625	564,852
Other liabilities		48,210	42,743
Variable Interest Entities
Total assets		2,905,295	2,568,378
Solar energy systems, net		2,712,377	2,385,329
Cash		105,494	118,352
Restricted cash		2,071	2,699
Accounts receivable, net		18,539	18,786
Prepaid expenses and other current assets		387	917
Other assets		66,427	42,295
Total liabilities		660,758	677,955
Accounts payable		12,136	15,929
Distributions payable to noncontrolling interests and redeemable noncontrolling interests		15,797	13,526
Accrued expenses and other liabilities		7,122	5,200
Deferred revenue		396,920	409,761
Deferred grants		29,229	30,406
Non-recourse debt		190,711	201,285
Other liabilities		$ 8,843	$ 1,848

[1] The Company’s consolidated assets as of December 31, 2018 and 2017 include $2,905,295 and $2,568,378, respectively, in assets of variable interest entities, or “VIEs”, that can only be used to settle obligations of the VIEs. Solar energy systems, net, as of December 31, 2018 and 2017 were $2,712,377 and $2,385,329, respectively; cash as of December 31, 2018 and 2017 were $105,494 and $118,352, respectively; restricted cash as of December 31, 2018 and 2017 were $2,071 and $2,699, respectively; accounts receivable, net as of December 31, 2018 and 2017 were $18,539 and $18,786, respectively; prepaid expenses and other current assets as of December 31, 2018 and 2017 were $387 and $917, respectively and other assets as of December 31, 2018 and 2017 were $66,427 and $42,295, respectively. The Company’s consolidated liabilities as of December 31, 2018 and 2017 include $660,758 and $677,955, respectively, in liabilities of VIEs whose creditors have no recourse to the Company. These liabilities include accounts payable as of December 31, 2018 and 2017 of $12,136 and $15,929, respectively; distributions payable to noncontrolling interests and redeemable noncontrolling interests as of December 31, 2018 and 2017 of $15,797 and $13,526, respectively; accrued expenses and other liabilities as of December 31, 2018 and 2017 of $7,122 and $5,200, respectively; deferred revenue as of December 31, 2018 and 2017 of $396,920 and $409,761, respectively; deferred grants as of December 31, 2018 and 2017 of $29,229 and $30,406, respectively; non-recourse debt as of December 31, 2018 and 2017 of $190,711 and $201,285, respectively; and other liabilities as of December 31, 2018 and December 31, 2017 of $8,843 thousand and $1,848, respectively.