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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net sales      
Net sales [1] $ 65,623 $ 115,944 $ 98,292
Cost of net sales      
Cost of net sales 41,466 83,676 65,146
Gross profit 24,157 32,268 33,146
Operating expenses:      
Selling, general and administrative [2] 15,827 15,156 16,777
Research and development 14,467 12,745 9,853
Total operating expenses 30,294 27,901 26,630
Operating income (loss) (6,137) 4,367 6,516
Interest income 1,337 1,749 1,177
Interest expense (16) (47) (48)
Other income (expense), net 872 (644) 2,976
Equity loss of associates   (613) (687)
Investment impairment   (370) (1,690)
Income before income taxes (3,944) 4,442 8,244
Income tax benefit (expense) 31 378 (1,263)
Net income (loss) $ (3,913) $ 4,820 $ 6,981
Net income (loss) per share Basic $ (0.11) $ 0.14 $ 0.20
Net income (loss) per share Diluted $ (0.11) $ 0.13 $ 0.19
Weighted average shares outstanding-Basic 35,556 35,642 35,467
Weighted average shares outstanding-Diluted 35,556 36,319 36,176
Net income (loss) $ (3,913) $ 4,820 $ 6,981
Other comprehensive income (loss), net of tax      
Net change in cumulative translation adjustment 529 (839) 409
Comprehensive income (loss) (3,384) 3,981 7,390
Products      
Net sales      
Net sales [1] 43,722 97,680 77,283
Cost of net sales      
Cost of net sales 29,566 72,082 50,636
Services      
Net sales      
Net sales [1] 21,901 18,264 21,009
Cost of net sales      
Cost of net sales $ 11,900 $ 11,594 $ 14,510
[1] The revenue recognized in the years ended December 31, 2019, 2018 and 2017 that was included in deferred revenue (including current and non-current) and customer advances as of the beginning of each respective period were $2.8 million, $4.0 million and $2.7 million, respectively.
[2] Allowances for doubtful accounts of $4.4 million, $0.8 million and reversal $0.06 million were recognized in the selling expenses in 2019, 2018 and 2017, respectively.