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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net sales      
Net sales [1] $ 15,921 $ 24,310 $ 65,623
Cost of net sales      
Cost of net sales 16,996 20,781 41,466
Gross profit (loss) (1,075) 3,529 24,157
Operating expenses:      
Selling, general and administrative [2] (2,642) 18,689 15,827
Research and development 6,886 8,083 14,467
Total operating expenses 4,244 26,772 30,294
Operating loss (5,319) (23,243) (6,137)
Interest income 1,136 990 1,337
Interest expense   (10) (16)
Other income (expense), net 1,649 (2,166) 872
Investment impairment (1,029)
Loss before income taxes (2,534) (25,458) (3,944)
Income tax benefit (expense) (3,294) 1,782 31
Net loss $ (5,828) $ (23,676) $ (3,913)
Net loss per share Basic $ (0.16) $ (0.66) $ (0.11)
Net loss per share Diluted $ (0.16) $ (0.66) $ (0.11)
Weighted average shares outstanding-Basic 36,027 35,881 35,556
Weighted average shares outstanding-Diluted 36,027 35,881 35,556
Net loss $ (5,828) $ (23,676) $ (3,913)
Other comprehensive income (loss), net of tax      
Net change in cumulative translation adjustment (3,726) 1,560 529
Comprehensive loss (9,554) (22,116) (3,384)
Products      
Net sales      
Net sales [1] 2,323 12,385 43,722
Cost of net sales      
Cost of net sales 6,681 11,148 29,566
Services      
Net sales      
Net sales [1] 13,598 11,925 21,901
Cost of net sales      
Cost of net sales $ 10,315 $ 9,633 $ 11,900
[1] Revenue recognized for the years ended December 31, 2021, 2020 and 2019 that was included in deferred revenue (including current and non-current) and customer advances as of the beginning of each year was $0.4 million, $1.2 million and $2.8 million, respectively.
[2] Allowances for credit losses of ($9.2 million), $9.4 million and $4.4 million were recognized as selling expenses in 2021, 2020 and 2019, respectively.