Other assets consist of the following (in thousands).



	December 31,
	2018		2017

Alameda security deposit (1)	$	55	$	321
CD for Green Bank collateral security (2)	1,026		1,019
Nevada sales and use tax deposit	49		49
Facility Closure Trust deposit (3)	670		450
	1,800		1,839
Less: current portion (1)	—		(275		)

Other assets, non-current	$	1,800	$	1,564


(1)	The lease deposit related to the Alameda headquarters was released over time: $275,000 was released in June 2018; the remainder will be released at the end of the lease term. The current portion in 2017 was included in prepaid expenses and other current assets in the consolidated balance sheet.


(2)	The $1.0 million certificate of deposit is held by Green Bank as collateral for the Green Bank note payable balance. The deposit with Green Bank will be released after TRIC has three consecutive months of positive cash flow from operations.

(3)

The Company has entered into a Facility Closure Trust Agreement for the benefit of the Nevada Division of Conservation and Natural Resources (NDEP). Funds deposited in the Trust are to be available when and if needed, for closure and/or post-closure care of the facility related to potential decontamination and hazardous material cleanup. The Trustee will reimburse the Company or other persons as specified by the NDEP from the fund for closure and post-closure expenditures in such amounts as the NDEP shall direct in writing. In addition, the Trustee shall refund to the Company such amounts as the NDEP specifies in writing. $100,000 was deposited upon establishment of the Trust Fund, on October 31, 2016; $350,000 was deposited on October 31, 2017; and $220,000 was deposited on October 31, 2018.