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Selected Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Financial Data |
|  | Year Ended December 31, 2017 |
|  | Q1 |  |  | Q2 |  |  | Q3 |  |  | Q4 |
Revenues |  | $ | 148 |  |  | $ | 105 |  |  | $ | 53 |  |  | $ | 21 |
Net loss |  | $ | (25,287 | ) |  | $ | (20,318 | ) |  | $ | (22,128 | ) |  | $ | (27,421 | )
Basic and diluted net loss per share |  | $ | (0.60 | ) |  | $ | (0.41 | ) |  | $ | (0.38 | ) |  | $ | (0.45 | )
Shares used to compute basic and diluted net loss per share |  |  | 41,830 |  |  |  | 49,700 |  |  |  | 57,650 |  |  |  | 61,007 |
|  | Year Ended December 31, 2016 |
|  | Q1 |  |  | Q2 |  |  | Q3 |  |  | Q4 |
Revenues |  | $ | 942 |  |  | $ | 2,647 |  |  | $ | 162 |  |  | $ | 7,292 |
Net loss |  | $ | (27,023 | ) |  | $ | (28,986 | ) |  | $ | (34,694 | ) |  | $ | (21,741 | )
Basic and diluted net loss per share |  | $ | (0.70 | ) |  | $ | (0.75 | ) |  | $ | (0.90 | ) |  | $ | (0.56 | )
Shares used to compute basic and diluted net loss per share |  |  | 38,472 |  |  |  | 38,496 |  |  |  | 38,512 |  |  |  | 38,544 |

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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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