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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Unaudited Financial Data | The following tables summarize the Company’s quarterly financial information for the years ended December 31, 2019 and 2018 (in thousands except per share amounts):
|  | Three Months Ended |
|  | March 31, 2019 |  |  | June 30, 2019 |  |  | September 30, 2019 |  |  | December 31, 2019 |
Product revenue |  | $ | 17,504 |  |  | $ | 18,209 |  |  | $ | 18,019 |  |  | $ | 20,917 |
Gross profit on product revenue |  |  | 9,072 |  |  |  | 10,098 |  |  |  | 10,436 |  |  |  | 11,624 |
Government contract revenue |  |  | 4,461 |  |  |  | 4,266 |  |  |  | 4,827 |  |  |  | 5,571 |
Net loss |  |  | (18,792 | ) |  |  | (17,562 | ) |  |  | (17,967 | ) |  |  | (16,923 | )
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | (0.14 | ) |  |  | (0.13 | ) |  |  | (0.13 | ) |  |  | (0.12 | )
Diluted |  |  | (0.14 | ) |  |  | (0.13 | ) |  |  | (0.13 | ) |  |  | (0.12 | )
|  | Three Months Ended |
|  | March 31, 2018 |  |  | June 30, 2018 |  |  | September 30, 2018 |  |  | December 31, 2018 |
Product revenue |  | $ | 13,564 |  |  | $ | 15,420 |  |  | $ | 15,399 |  |  | $ | 16,525 |
Gross profit on product revenue |  |  | 6,234 |  |  |  | 7,700 |  |  |  | 7,257 |  |  |  | 8,083 |
Government contract revenue |  |  | 3,455 |  |  |  | 4,047 |  |  |  | 3,928 |  |  |  | 3,713 |
Net loss |  |  | (13,885 | ) |  |  | (13,282 | ) |  |  | (14,192 | ) |  |  | (16,205 | )
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | (0.11 | ) |  |  | (0.10 | ) |  |  | (0.11 | ) |  |  | (0.12 | )
Diluted |  |  | (0.11 | ) |  |  | (0.10 | ) |  |  | (0.11 | ) |  |  | (0.12 | )

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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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