Revenue from Contracts with Customers - Summary of Revenue Disaggregated by Geographical Region and Source of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 28,097	$ 28,419
Product Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	27,649	26,086
Subsea Projects [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	407	2,221
Research Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	41	112
Asia [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	5,588	10,104
Canada [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	964	455
Europe [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	7,246	3,137
Latin America [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1,544	1,050
U.S. [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	12,755	13,673
U.S. [Member] | Product Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	12,714	12,453
U.S. [Member] | Subsea Projects [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		1,108
U.S. [Member] | Research Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	41	112
International [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	15,342	14,746
International [Member] | Product Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	14,935	13,633
International [Member] | Subsea Projects [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 407	$ 1,113