5. INTANGIBLE AND OTHER ASSETS

Intangible Assets

The Company has intangible assets not subject to amortization, which include certain costs to obtain or defend regulatory authorizations and a portion of capitalized interest associated with these assets. These costs include primarily efforts related to the enhancement of the Company's licensed MSS spectrum to provide terrestrial wireless services as well as costs with international regulatory agencies to obtain similar terrestrial authorizations outside of the United States. This category includes work in progress assets as well as indefinite lived assets already placed into service. The Company also has intangible assets subject to amortization, which include primarily developed technology and definite lived MSS licenses.

The gross carrying amount and accumulated amortization of the Company's intangible assets consist of the following (in thousands):



	December 31, 2019							December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Intangible Assets Not Subject to Amortization	$	18,288	$	—		$	18,288	$	20,215	$	—		$	20,215

Intangible Assets Subject to Amortization:
Developed technology	$	11,692	$	(6,232	)	$	5,460	$	9,415	$	(5,478	)	$	3,937
Customer relationships	2,100		(2,100		)	—		2,100		(2,100		)	—
Regulatory authorizations	1,937		(477		)	1,460		1,109		(152		)	957
Trade name	200		(200		)	—		200		(200		)	—
	$	15,929	$	(9,009	)	$	6,920	$	12,824	$	(7,930	)	$	4,894

Total	$	34,217	$	(9,009	)	$	25,208	$	33,039	$	(7,930	)	$	25,109

During 2019, the Company completed the acquisition of certain assets and related government authorizations from the owner of its IGO in Argentina. Included in this asset purchase was an indefinite lived spectrum license totaling $1.0 million.

For 2019 and 2018, the Company recorded amortization expense on these intangible assets of $1.1 million and $0.6 million, respectively. Amortization expense is recorded in operating expenses in the Company’s consolidated statements of operations.

Excluding the effects of any acquisitions, dispositions or write-downs subsequent to December 31, 2019, total estimated annual amortization of intangible assets is as follows (in thousands):



2020	$	1,158
2021	1,081
2022	1,081
2023	813
2024	583
Thereafter	2,204
Total	$	6,920

Other Assets

Other assets consist of the following (in thousands):



	December 31,
	2019		2018
Costs to obtain a contract	$	1,976	$	2,018
Long-term prepaid licenses and royalties	5,037		5,209
Business economic loss claim receivable (see Note 10 for further discussion)	—		3,684
International tax receivables	800		840
Investments in businesses	2,089		2,089
Other long-term assets	535		1,337
	$	10,437	$	15,177