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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Summary of Quarterly Financial Data | The following table sets forth certain unaudited quarterly financial data for the eight quarters ended December 31, 2016.
|  | 2016 |  |  | 2015 |
|  | Q1 |  |  | Q2 |  |  | Q3 |  |  | Q4 |  |  | Q1 |  |  | Q2 |  |  | Q3 |  |  | Q4 |
Revenues |  | $ | 3,942 |  |  | $ | 3,702 |  |  | $ | 2,823 |  |  | $ | 8,922 |  |  | $ | 13,491 |  |  | $ | 8,358 |  |  | $ | 8,569 |  |  | $ | 9,121 |
Expenses |  | $ | 20,623 |  |  | $ | 30,544 |  |  | $ | 22,029 |  |  | $ | 18,752 |  |  | $ | 19,712 |  |  | $ | 20,635 |  |  | $ | 21,254 |  |  | $ | 24,794 |
Net loss |  | $ | (16,494 | ) |  | $ | (26,575 | ) |  | $ | (18,965 | ) |  | $ | (9,624 | ) |  | $ | (5,319 | ) |  | $ | (12,126 | ) |  | $ | (9,245 | ) |  | $ | (14,013 | )
Net loss per share |  | $ | (0.23 | ) |  | $ | (0.38 | ) |  | $ | (0.27 | ) |  | $ | (0.14 | ) |  | $ | (0.08 | ) |  | $ | (0.17 | ) |  | $ | (0.13 | ) |  | $ | (0.20 | )

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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=68076893&loc=d3e1280-108306 + Details
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