2. REVENUE

Disaggregation of Revenue

The following table discloses revenue disaggregated by type of product and service (amounts in thousands):



	Three Months Ended
	March 31, 2020		March 31, 2019
Service revenue:
Duplex	$	7,663	$	8,645
SPOT	12,123		13,095
Commercial IoT	4,310		3,698
IGO	91		166
Engineering and other	4,748		515
Total service revenue	28,935		26,119

Subscriber equipment sales:
Duplex	$	404	$	251
SPOT	1,407		1,591
Commercial IoT	1,413		2,072
Other	35		45
Total subscriber equipment sales	3,259		3,959

Total revenue	$	32,194	$	30,078

Engineering and other service revenue includes revenue generated primarily from certain governmental and engineering service contracts. During the first quarter of 2020, the Company recognized $4.0 million in revenue related to the completion of certain milestones for non-recurring engineering services under the Terms Agreement described in its 2019 Annual Report.

The Company attributes equipment revenue to various countries based on the location where equipment is sold. Service revenue is generally attributed to the various countries based on the Globalstar entity that holds the customer contract. The following table discloses revenue disaggregated by geographical market (amounts in thousands):



	Three Months Ended
	March 31, 2020			March 31, 2019
Service revenue:
United States	$	22,689		$	19,252
Canada	3,971			3,811
Europe	1,361			2,122
Central and South America	710			564
Others	204			370
Total service revenue	28,935			26,119

Subscriber equipment sales:
United States	$	1,443		$	2,211
Canada	1,083			812
Europe	494			577
Central and South America	266			312
Others	(27		)	47
Total subscriber equipment sales	3,259			3,959

Total revenue	$	32,194		$	30,078

Contract Balances

The following table discloses information about accounts receivable, costs to obtain a contract (as recorded in intangible and other assets, net on the Company's condensed consolidated balance sheet), and contract liabilities (as recorded in both current and long-term deferred revenue on the Company's condensed consolidated balance sheet) from contracts with customers (amounts in thousands):



	March 31, 2020		December 31, 2019
Accounts receivable	$	21,544	$	21,760
Capitalized costs to obtain a contract	1,919		1,976
Contract liabilities	32,408		35,183

Accounts Receivable

Included in the accounts receivable balance in the table above are contract assets, which represent primarily unbilled amounts related to performance obligations satisfied by the Company of $2.5 million and $2.2 million as of March 31, 2020 and December 31, 2019, respectively.

The Company has agreements with certain of its independent gateway operators ("IGOs") whereby the parties net settle outstanding payables and receivables between the respective entities on a periodic basis. As of March 31, 2020 and December 31, 2019, $6.1 million and $6.5 million, respectively, related to these agreements was included in accounts receivable on the Company’s condensed consolidated balance sheet.

Costs to Obtain a Contract

The Company also capitalizes costs to obtain a contract, which include certain deferred subscriber acquisition costs that are amortized consistently with the pattern of transfer of the good or delivery of the service to which the asset relates. The Company’s subscriber acquisition costs primarily include dealer and internal sales commissions and certain other costs, including but not limited to, promotional costs, cooperative marketing credits and shipping and fulfillment costs. The Company capitalizes incremental costs to obtain a contract to the extent it expects to recover them. These capitalized contract costs include only internal and external initial activation commissions as they are considered incremental and would not have been incurred if the contract had not been obtained. These capitalized costs are included in other assets on the Company’s condensed consolidated balance sheet and are amortized to marketing, general and administrative expenses on the Company’s condensed consolidated statement of operations on a straight-line basis over the estimated customer life of three years, which considers anticipated contract renewals. For the three months ended March 31, 2020 and 2019, the amount of amortization related to previously capitalized costs to obtain a contract was $0.3 million and $0.4 million, respectively.

Contract Liabilities

Contract liabilities, which are included in deferred revenue on the Company’s condensed consolidated balance sheet, represent the Company’s obligation to transfer service or equipment to a customer from whom it has previously received consideration. The amount of revenue recognized during the three months ended March 31, 2020 and 2019 from performance obligations included in the contract liability balance at the beginning of each of the periods was $13.3 million and $13.7 million, respectively.

In general, the duration of the Company’s contracts is one year or less; however, from time to time, the Company offers multi-year contracts. As of March 31, 2020, the Company expects to recognize $27.2 million, or approximately 84%, of its remaining performance obligations during the next twelve months and $2.3 million, or approximately 7%, between two to six years from the balance sheet date. The remaining $2.9 million, or approximately 9%, is related to a single contract and will be recognized as work is performed by the Company, the timing of which is currently unknown.