OTHER ASSETS

Prepaid expenses and other current assets consist of the following at December 31:



	2017		2016
Commodity derivatives and related collateral, net	$	1,610	$	7,127
Prepaid expenses	11,733		10,665
Deposits	2,899		2,897
RIN inventory	27,028		9,398
Taxes receivable	6,356		4,539
Other	2,254		1,646
Total	$	51,880	$	36,272

RIN inventory is valued at the lower of cost or net realizable value and consists of (i) RINs the Company generates in connection with its production of biomass-based diesel and (ii) RINs acquired from third parties. RINs generated by the Company are recorded at no cost, as these RINs are government incentives and not a tangible output from its biomass-based diesel production. The cost of RINs acquired from third parties is determined using the average cost method. RIN market value is based upon pricing as reported by the Oil Price Information Service (OPIS). Since RINs generated by the Company have zero cost associated to them, the lower of cost or market adjustment in RIN inventory reflects only the value of RINs obtained from third parties. RIN inventory values were adjusted in the amount of $2,629 and $612 at December 31, 2017 and 2016, respectively, to reflect the lower of cost or market.

Other noncurrent assets consist of the following at December 31:



	2017		2016
Spare parts inventory	$	2,764	$	3,532
Catalysts	2,962		4,479
Deposits	381		2,392
Other	933		2,227
Total	$	7,040	$	12,630