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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Cash and cash equivalents (including amounts in VIEs of $1,255 and $444, respectively) | $ 61,397 | $ 24,262
Restricted cash (including amounts in VIEs of $156 and $155, respectively) | 16,880 | 15,751
Accounts receivable, net (including amounts in VIEs of $374 and $328, respectively) | 85,985 | 85,121
Costs and estimated earnings in excess of billings (including amounts in VIEs of $498 and $360, respectively) | 86,842 | 104,852
Prepaid expenses and other current assets (including amounts in VIEs of $190 and $8, respectively) | 11,571 | 14,037
Energy assets, net (including amounts in VIEs of $122,641 and $55,712, respectively) | 459,952 | 356,443
Other assets (including amounts in VIEs of $1,613 and $1,398, respectively) | 29,394 | 27,635
Current portions of long-term debt and capital lease liabilities (including amounts in VIEs of $1,712 and $0, respectively) | 26,890 | 22,375
Accounts payable (including amounts in VIEs of $234 and $764, respectively) | 134,330 | 135,881
Accrued expenses and other current liabilities (including amounts in VIEs of $4,233 and $149, respectively) | 35,947 | 23,260
Long-term debt and capital lease liabilities, less current portions and net of deferred financing fees (including amounts in VIEs of $26,461 and $0, respectively) | 219,162 | 173,237
Other liabilities (including amounts in VIEs of $2,131 and $0, respectively) | $ 29,212 | $ 18,754
Preferred stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001
Preferred stock, shares authorized (in shares) | 5,000,000 | 5,000,000
Preferred stock, shares issued (in shares) | 0 | 0
Preferred stock, shares outstanding (in shares) | 0 | 0
Treasury stock, shares (in shares) | 2,091,040 | 1,873,266
Class A Common Stock |  |
Common stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001
Common stock, shares authorized (in shares) | 500,000,000 | 500,000,000
Common stock, shares issued (in shares) | 30,366,546 | 29,406,315
Common stock, shares outstanding (in shares) | 28,275,506 | 27,533,049
Class B Common Stock |  |
Common stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001
Common stock, shares authorized (in shares) | 144,000,000 | 144,000,000
Common stock, shares issued (in shares) | 18,000,000 | 18,000,000
Common stock, shares outstanding (in shares) | 18,000,000 | 18,000,000
Variable Interest Entity |  |
Cash and cash equivalents (including amounts in VIEs of $1,255 and $444, respectively) | $ 1,255 | $ 444
Restricted cash (including amounts in VIEs of $156 and $155, respectively) | 156 | 155
Accounts receivable, net (including amounts in VIEs of $374 and $328, respectively) | 374 | 328
Costs and estimated earnings in excess of billings (including amounts in VIEs of $498 and $360, respectively) | 498 | 360
Prepaid expenses and other current assets (including amounts in VIEs of $190 and $8, respectively) | 190 | 8
Energy assets, net (including amounts in VIEs of $122,641 and $55,712, respectively) | 122,641 | 55,712
Other assets (including amounts in VIEs of $1,613 and $1,398, respectively) | 1,613 | 1,398
Current portions of long-term debt and capital lease liabilities (including amounts in VIEs of $1,712 and $0, respectively) | 1,712 | 0
Accounts payable (including amounts in VIEs of $234 and $764, respectively) | 234 | 764
Accrued expenses and other current liabilities (including amounts in VIEs of $4,233 and $149, respectively) | 4,233 | 149
Long-term debt and capital lease liabilities, less current portions and net of deferred financing fees (including amounts in VIEs of $26,461 and $0, respectively) | 26,461 | 0
Other liabilities (including amounts in VIEs of $2,131 and $0, respectively) | $ 2,131 | $ 0

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