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Unaudited Selected Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2019
Unaudited Selected Quarterly Financial Data [Abstract] |
Schedule of Unaudited Quarterly Financial Data | ﻿
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﻿ | Fiscal 2019 Quarter Ended
﻿(in thousands, except per share data) | March 31, |  | June 30, |  | September 30, |  | December 31, |
﻿Total revenue | $ | 16,425 |  | $ | 24,621 |  | $ | 21,915 |  | $ | 27,930 |
﻿Total gross profit |  | 5,117 |  |  | 9,613 |  |  | 6,914 |  |  | 12,932 |
﻿Total operating expenses |  | 35,251 |  |  | 33,993 |  |  | 35,028 |  |  | 30,849 |
﻿Loss from operations |  | (30,134) |  |  | (24,380) |  |  | (28,114) |  |  | (17,917) |
﻿Gain from Continuation Advances (1) |  | — |  |  | — |  |  | — |  |  | 18,000 |
﻿Net loss |  | (30,324) |  |  | (24,596) |  |  | (29,123) |  |  | (91) |
﻿Basic and diluted net loss per share | $ | (0.20) |  | $ | (0.16) |  | $ | (0.19) |  | $ | (0.0) |
﻿Weighted average shares used in computing net loss per share |  | 151,274 |  |  | 152,776 |  |  | 152,983 |  |  | 153,051 |
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﻿ | Fiscal 2018 Quarter Ended
﻿(in thousands, except per share data) | March 31, |  | June 30, |  | September 30, |  | December 31, |
﻿Total revenue | $ | 19,362 |  | $ | 21,578 |  | $ | 18,160 |  | $ | 19,526 |
﻿Total gross profit |  | 7,296 |  |  | 8,862 |  |  | 3,192 |  |  | 5,746 |
﻿Total operating expenses |  | 31,245 |  |  | 30,607 |  |  | 27,862 |  |  | 36,369 |
﻿Loss from operations |  | (23,949) |  |  | (21,745) |  |  | (24,670) |  |  | (30,623) |
﻿Net loss |  | (24,179) |  |  | (22,540) |  |  | (25,044) |  |  | (30,799) |
﻿Basic and diluted net loss per share | $ | (0.20) |  | $ | (0.17) |  | $ | (0.19) |  | $ | (0.21) |
﻿Weighted average shares used in computing net loss per share |  | 123,768 |  |  | 131,882 |  |  | 135,130 |  |  | 149,314 |
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﻿ (1) In accordance with the terms of the Merger Agreement, during the fourth quarter of 2019 we received Continuation Advances totaling $18.0 million from Illumina. Please see “Note 2 Termination of Merger with Illumina” for additional information.

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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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