Revenue from Contracts with Customers - Summary of Revenue Disaggregated by Geographical Region and Source of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 30,380	$ 24,195	$ 90,147	$ 77,255
Product Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	27,650	20,919	86,122	68,433
Subsea Projects [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	2,613	3,020	3,687	8,339
Research Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	117	256	338	483
Asia [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	5,283	9,617	15,424	33,373
Canada [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	256	25	2,211	715
Europe [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	7,553	4,635	24,234	9,590
Latin America [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	554	182	3,245	2,076
U.S. [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	16,734	9,736	45,033	31,501
U.S. [Member] | Product Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	16,617	8,612	44,695	29,039
U.S. [Member] | Subsea Projects [Member]
Disaggregation Of Revenue [Line Items]
Total revenue		868		1,979
U.S. [Member] | Research Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	117	256	338	483
International [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	13,646	14,459	45,114	45,754
International [Member] | Product Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	11,033	12,307	41,427	39,394
International [Member] | Subsea Projects [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 2,613	$ 2,152	$ 3,687	$ 6,360