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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Quarterly consolidated statement of operations | Selected summarized quarterly financial information for the years ended December 31, 2019 and 2018 is as follows (in thousands, except per share amounts):
| Q1 2019 |  | Q2 2019 |  | Q3 2019 |  | Q4 2019 |  | 2019 (1)
Revenues | $ | 5,122 |  |  | $ | 8,743 |  |  | $ | 10,624 |  |  | $ | 11,464 |  |  | $ | 35,953 |
Gross profit | $ | 5,107 |  |  | $ | 8,703 |  |  | $ | 10,562 |  |  | $ | 11,411 |  |  | $ | 35,783 |
Operating income (loss) | $ | (11,499 | ) |  | $ | (9,155 | ) |  | $ | (1,275 | ) |  | $ | 478 |  |  | $ | (21,451 | )
Income (loss) before provision for taxes | $ | (10,901 | ) |  | $ | (8,623 | ) |  | $ | (1,299 | ) |  | $ | 1,250 |  |  | $ | (19,573 | )
Benefit (provision) for income taxes | $ | (115 | ) |  | $ | 3 |  |  | $ | (88 | ) |  | $ | (271 | ) |  | $ | (471 | )
Net income (loss) | $ | (11,016 | ) |  | $ | (8,620 | ) |  | $ | (1,387 | ) |  | $ | 979 |  |  | $ | (20,044 | )
Basic net income (loss) per share | $ | (0.35 | ) |  | $ | (0.27 | ) |  | $ | (0.04 | ) |  | $ | 0.03 |  |  | $ | (0.64 | )
Shares used in calculating basic net income (loss) per share | 31,089 |  |  | 31,578 |  |  | 31,711 |  |  | 31,731 |  |  | 31,529 |
Diluted net income (loss) per share | $ | (0.35 | ) |  | $ | (0.27 | ) |  | $ | (0.04 | ) |  | $ | 0.03 |  |  | $ | (0.64 | )
Shares used in calculating diluted net income (loss) per share | 31,089 |  |  | 31,578 |  |  | 31,711 |  |  | 31,904 |  |  | 31,529 |
(1) Quarterly income (loss) per share amounts were calculated separately for each period, therefore the sum of the quarterly amounts may differ from the total income (loss) per share amount for the year.
| Q1 2018 |  | Q2 2018 |  | Q3 2018 |  | Q4 2018 |  | 2018 (1)
Revenues | $ | 85,416 |  |  | $ | 6,144 |  |  | $ | 8,552 |  |  | $ | 10,867 |  |  | $ | 110,979 |
Gross profit | $ | 85,381 |  |  | $ | 6,050 |  |  | $ | 8,491 |  |  | $ | 10,839 |  |  | $ | 110,761 |
Operating income (loss) | $ | 70,105 |  |  | $ | (8,295 | ) |  | $ | (5,163 | ) |  | $ | (3,546 | ) |  | $ | 53,101 |
Income (loss) before provision for taxes | $ | 70,336 |  |  | $ | (7,920 | ) |  | $ | (4,618 | ) |  | $ | (3,063 | ) |  | $ | 54,735 |
Benefit (provision) for income taxes | $ | (453 | ) |  | $ | 162 |  |  | $ | (22 | ) |  | $ | (79 | ) |  | $ | (392 | )
Net income (loss) | $ | 69,883 |  |  | $ | (7,758 | ) |  | $ | (4,640 | ) |  | $ | (3,142 | ) |  | $ | 54,343 |
Basic net income (loss) per share | $ | 2.35 |  |  | $ | (0.25 | ) |  | $ | (0.15 | ) |  | $ | (0.10 | ) |  | $ | 1.78 |
Shares used in calculating basic net income (loss) per share | 29,700 |  |  | 30,527 |  |  | 30,780 |  |  | 30,814 |  |  | 30,459 |
Diluted net income (loss) per share | $ | 2.29 |  |  | $ | (0.25 | ) |  | $ | (0.15 | ) |  | $ | (0.10 | ) |  | $ | 1.73 |
Shares used in calculating diluted net income (loss) per share | 30,566 |  |  | 30,527 |  |  | 30,780 |  |  | 30,814 |  |  | 31,407 |
(1) Quarterly income (loss) per share amounts were calculated separately for each period, therefore the sum of the quarterly amounts may differ from the total income (loss) per share amount for the year.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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