CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash, cash equivalents and current portion of restricted cash	$ 30,624	$ 37,208
Short-term investments	65,646	141,462
Accounts receivable, net of allowance for doubtful accounts of $1,276 and $1,919 as of December 31, 2017 and 2018, respectively	68,865	63,961
Other receivables	15,544	19,235
Inventory	34,975	35,238
Prepaid expenses and other current assets	8,444	7,793
Derivative assets, related party	1,508	0
Total current assets	225,606	304,897
Land, property and equipment, net	350,568	367,305
Long-term portion of restricted cash	4,000	0
Notes receivable and other long-term assets, net	17,470	21,397
Long-term portion of derivative assets, related party	8,824	0
Investments in other entities	26,079	30,395
Goodwill	64,328	64,328
Intangible assets, net	2,207	3,590
Total assets	699,082	791,912
Current liabilities:
Current portion of debt and capital lease obligations	5,405	139,699
Accounts payable	19,024	17,901
Accrued liabilities	48,469	42,268
Deferred revenue	7,361	3,432
Total current liabilities	80,259	203,300
Long-term portion of debt, capital lease and financing lease obligations	78,779	120,388
Other long-term liabilities	15,035	18,566
Total liabilities	174,073	342,254
Commitments and contingencies (Note 16)
Stockholders’ equity:
Preferred stock, $0.0001 par value. Authorized 1,000,000 shares; issued and outstanding no shares	0	0
Common stock, $0.0001 par value. Authorized 224,000,000 shares and 304,000,000 shares as of December 31, 2017 and 2018, respectively; issued and outstanding 151,650,969 shares and 203,599,892 shares as of December 31, 2017 and 2018, respectively	20	15
Additional paid-in capital	1,198,769	1,111,432
Accumulated deficit	(688,653)	(683,570)
Accumulated other comprehensive loss	(2,138)	(887)
Total Clean Energy Fuels Corp. stockholders’ equity	507,998	426,990
Noncontrolling interest in subsidiary	17,011	22,668
Total stockholders’ equity	525,009	449,658
Total liabilities and stockholders’ equity	$ 699,082	$ 791,912