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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017 and 2016 (in thousands except per share amounts):
|  | Three Months Ended |
|  | March 31, 2017 |  |  | June 30, 2017 |  |  | September 30, 2017 |  |  | December 31, 2017 |
Product revenue |  | $ | 7,006 |  |  | $ | 9,525 |  |  | $ | 10,797 |  |  | $ | 16,240 |
Gross profit on product revenue |  |  | 3,312 |  |  |  | 5,165 |  |  |  | 5,449 |  |  |  | 7,111 |
Government contract revenue |  |  | 1,428 |  |  |  | 1,667 |  |  |  | 2,285 |  |  |  | 2,378 |
Net loss |  |  | (18,598 | ) |  |  | (17,083 | ) |  |  | (13,418 | ) |  |  | (11,486 | )
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | (0.18 | ) |  |  | (0.16 | ) |  |  | (0.12 | ) |  |  | (0.10 | )
Diluted |  |  | (0.18 | ) |  |  | (0.16 | ) |  |  | (0.12 | ) |  |  | (0.10 | )
|  | Three Months Ended |
|  | March 31, 2016 |  |  | June 30, 2016 |  |  | September 30, 2016 |  |  | December 31, 2016 |
Product revenue |  | $ | 7,632 |  |  | $ | 9,251 |  |  | $ | 10,175 |  |  | $ | 10,125 |
Gross profit on product revenue |  |  | 3,369 |  |  |  | 4,275 |  |  |  | 4,724 |  |  |  | 4,520 |
Government contract revenue |  |  | — |  |  |  | — |  |  |  | 261 |  |  |  | 1,831 |
Net loss |  |  | (16,863 | ) |  |  | (18,166 | ) |  |  | (14,376 | ) |  |  | (13,501 | )
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | (0.17 | ) |  |  | (0.18 | ) |  |  | (0.14 | ) |  |  | (0.13 | )
Diluted |  |  | (0.17 | ) |  |  | (0.18 | ) |  |  | (0.14 | ) |  |  | (0.13 | )

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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