Revenue

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Revenue

2. REVENUE

Disaggregation of Revenue

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

	Three Months Ended				Six Months Ended
	June 30, 2020		June 30, 2019		June 30, 2020		June 30, 2019
Service revenue:
Duplex	$	8,556	$	9,031	$	16,219	$	17,676
SPOT	11,579		12,619		23,702		25,714
Commercial IoT	4,298		4,353		8,608		8,051
IGO	109		179		200		345
Engineering and other	2,548		518		7,296		1,033
Total service revenue	27,090		26,700		56,025		52,819
Subscriber equipment sales:
Duplex	$	625	$	306	$	1,029	$	557
SPOT	1,695		2,186		3,102		3,777
Commercial IoT	939		1,972		2,352		4,044
Other	15		27		50		72
Total subscriber equipment sales	3,274		4,491		6,533		8,450
Total revenue	$	30,364	$	31,191	$	62,558	$	61,269

Engineering and other service revenue includes revenue generated primarily from certain governmental and engineering service contracts. During the three and six months ended June 30, 2020, the Company recognized $2.0 million and $6.0 million, respectively, 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				Six Months Ended
	June 30, 2020		June 30, 2019		June 30, 2020		June 30, 2019
Service revenue:
United States	$	20,016	$	19,452	$	42,705	$	38,704
Canada	4,392		4,331		8,363		8,142
Europe	1,791		2,212		3,152		4,334
Central and South America	669		570		1,379		1,134
Others	222		135		426		505
Total service revenue	27,090		26,700		56,025		52,819
Subscriber equipment sales:
United States	$	1,721	$	2,549	$	3,164	$	4,760
Canada	859		1,133		1,942		1,946
Europe	376		440		870		1,017
Central and South America	306		349		572		661
Others	12		20		(15)		66
Total subscriber equipment sales	3,274		4,491		6,533		8,450
Total revenue	$	30,364	$	31,191	$	62,558	$	61,269

Accounts Receivable

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 June 30, 2020 and December 31, 2019, $6.3 million and $6.5 million, respectively, related to these agreements was included in accounts receivable on the Company’s condensed consolidated balance sheet.

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 six months ended June 30, 2020 and 2019 from performance obligations included in the contract liability balance at the beginning of each of the periods was $24.4 million and $21.4 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 June 30, 2020, the Company expects to recognize $27.0 million, or approximately 84%, of its remaining performance obligations during the next twelve months.