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Quarterly Results of Operations (Unaudited) - Quarterly Consolidated Statement of Operations Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 6,896 | $ 11,863 | $ 7,030 | $ 9,224 | $ 9,293 | $ 26,306 | $ 7,864 | $ 13,623 | $ 35,013 | $ 57,086 | $ 63,393
Gross profit | 6,857 | 11,802 | 6,976 | 9,181 | 9,235 | 26,255 | 7,805 | 13,600 |  |  |
Operating income (loss) | (12,216) | (5,443) | (14,911) | (12,852) | (11,208) | 10,114 | (9,561) | (4,608) | (45,422) | (15,263) | 4,719
Income (loss) from continuing operations before provisions for income taxes | (12,109) | (5,243) | (14,746) | (12,713) | (11,363) | 10,778 | (9,528) | (4,396) | (44,811) | (14,509) | 4,449
Benefit (provision) for income taxes | (185) | (44) | (99) | (152) | (26,785) | (3,760) | (3,323) | (1,701) | (480) | (25,521) | (1,591)
Income (loss) from continuing operations | (12,294) | (5,287) | (14,845) | (12,865) | (38,148) | 7,018 | (6,205) | (2,695) | (45,291) | (40,030) | 2,858
Income from discontinued operations, net of tax | 0 | 0 | 0 | 0 | 0 | 0 | 649 | 0 | 0 | 649 | 0
Net income (loss) | $ (12,294) | $ (5,287) | $ (14,845) | $ (12,865) | $ (38,148) | $ 7,018 | $ (5,556) | $ (2,695) | $ (45,291) | $ (39,381) | $ 2,858
Basic net income (loss) per share - Continuing operations (in dollars per share) | $ (0.42) | $ (0.18) | $ (0.51) | $ (0.44) | $ (1.32) | $ 0.24 | $ (0.22) | $ (0.09) | $ (1.55) | $ (1.39) | $ 0.10
Basic net income (loss) per share - Discontinued operations (in dollars per share) | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.00 | 0.00 | 0.02 | 0.00
Basic net income (loss) per share (in dollars per share) | $ (0.42) | $ (0.18) | $ (0.51) | $ (0.44) | $ (1.32) | $ 0.24 | $ (0.20) | $ (0.09) | $ (1.55) | $ (1.37) | $ 0.10
Shares used in calculating basic net income (loss) per share (in shares) | 29,250 | 29,245 | 29,193 | 29,024 | 28,860 | 28,849 | 28,834 | 28,493 | 29,179 | 28,759 | 28,097
Diluted net income (loss) per share - Continuing operations (in dollars per share) | $ (0.42) | $ (0.18) | $ (0.51) | $ (0.44) | $ (1.32) | $ 0.24 | $ (0.22) | $ (0.09) | $ (1.55) | $ (1.39) | $ 0.10
Diluted net income (loss) per share - Discontinued operations (in dollars per share) | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.00 | 0.00 | 0.02 | 0.00
Diluted net income (loss) per share (in dollars per shares) | $ (0.42) | $ (0.18) | $ (0.51) | $ (0.44) | $ (1.32) | $ 0.24 | $ (0.20) | $ (0.09) | $ (1.55) | $ (1.37) | $ 0.10
Shares used in computation of diluted net income (loss) per share (in shares) | 29,250 | 29,245 | 29,193 | 29,024 | 28,860 | 29,298 | 28,834 | 28,493 | 29,179 | 28,759 | 29,015
Samsung Electronics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 19,000 |  |  |  |  |  |  |  |  |

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