Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2018

Revenue From Contract With Customer [Abstract]

Summary of Revenue Disaggregated by Geographical Region and Source of Revenue

In the following table, revenue is disaggregated by primary geographical region and source of revenue:

	Three Months ended
	March 31, 2018
	U.S.		International		Total
	(In thousands)
Geographical region
Asia	$	—	$	8,228	$	8,228
Canada		—		1,675		1,675
Europe		—		2,455		2,455
Latin America		—		834		834
U.S.		9,882		—		9,882
	$	9,882	$	13,192	$	23,074
Source of revenue
Product revenue	$	9,324	$	12,353	$	21,677
Subsea projects		5		839		844
Research services		553		—		553
	$	9,882	$	13,192	$	23,074

Summary of Changes in Contract Assets and Contract Liabilities

The following table presents changes in the Company’s contract assets and contract liabilities during the three months ended March 31, 2018:

	Balance at December 31, 2017		Additions		Deductions			Balance at March 31, 2018
	(In thousands)
Contract assets
Subsea projects	$	2,463	$	466	$	(2,925	)	$	4
Research services		425		552		(518	)		459
Total contract assets		2,888		1,018		(3,443	)		463
Contract liabilities
Deferred revenue
Product revenue		1,178		1,025		(696	)		1,507
Subsea projects		126		—		(126	)		—
Total contract liabilities	$	1,304	$	1,025	$	(822	)	$	1,507