v3.26.1
Segment Reporting (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Mar. 31, 2026
segment
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
segment
Jun. 30, 2025
USD ($)
segment
Segment Reporting [Abstract]          
Number of reportable segments | segment       2 2
Number of reportable segments separated into | segment   2      
Segment Reporting [Line Items]          
Revenue $ 11,996   $ 28,051 $ 21,702 $ 36,116
Cost of revenue 3,039   10,097 8,411 13,704
Restructuring - inventory reserve 0   0 1,632 0
Gross profit 8,957   17,954 11,659 22,412
Operating expenses:          
General and administrative 6,801   7,669 13,256 16,243
Sales and marketing 4,336   5,360 9,455 10,266
Research and development 2,849   3,451 5,638 6,452
Restructuring charges 855   0 2,391 539
Impairment of goodwill 0   0 1,662 0
Total operating expenses 14,841   16,480 32,402 33,500
Income (loss) from operations (5,884)   1,474 (20,743) (11,088)
Desalination          
Segment Reporting [Line Items]          
Revenue 11,483   25,500 20,390 33,259
Wastewater          
Segment Reporting [Line Items]          
Revenue 513   2,339 1,114 2,644
Operating Segments | Desalination          
Segment Reporting [Line Items]          
Revenue 11,483   25,500 20,390 33,259
Cost of revenue 2,781   9,259 7,723 12,641
Restructuring - inventory reserve 0     0  
Gross profit 8,702   16,241 12,667 20,618
Operating expenses:          
General and administrative 1,025   788 1,781 1,633
Sales and marketing 2,453   2,183 4,938 4,291
Research and development 2,391   1,370 4,007 2,219
Restructuring charges 0   0 335 107
Impairment of goodwill 0     0  
Total operating expenses 5,869   4,341 11,061 8,250
Income (loss) from operations 2,833   11,900 1,606 12,368
Operating Segments | Wastewater          
Segment Reporting [Line Items]          
Revenue 513   2,339 1,114 2,644
Cost of revenue 258   667 628 846
Restructuring - inventory reserve 0     0  
Gross profit 255   1,672 486 1,798
Operating expenses:          
General and administrative 872   535 1,853 1,263
Sales and marketing 1,209   1,097 2,372 2,134
Research and development 262   234 398 563
Restructuring charges 0   0 18 103
Impairment of goodwill 0     0  
Total operating expenses 2,343   1,866 4,641 4,063
Income (loss) from operations (2,088)   (194) (4,155) (2,265)
Corporate and Other          
Segment Reporting [Line Items]          
Revenue 0   212 198 213
Cost of revenue 0   171 60 217
Restructuring - inventory reserve 0     1,632  
Gross profit 0   41 (1,494) (4)
Operating expenses:          
General and administrative 4,904   6,346 9,622 13,347
Sales and marketing 674   2,080 2,145 3,841
Research and development 196   1,847 1,233 3,670
Restructuring charges 855   0 2,038 329
Impairment of goodwill 0     1,662  
Total operating expenses 6,629   10,273 16,700 21,187
Income (loss) from operations $ (6,629)   $ (10,232) $ (18,194) $ (21,191)