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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Schedule of selected quarterly financial data (unaudited) | The results of operations for any quarter are not necessarily indicative of the results to be expected for any future period (in thousands of dollars, except for share and per share data):
Quarter Ended | March 31 |  | June 30 |  | September 30 |  | December 31
2016: |  |  |  |  |  |  |  |  |  |  |
Revenue | $ | 13,550 |  |  | $ | 14,675 |  |  | $ | 18,603 |  |  | $ | 18,257 |
Net loss | (10,075 | ) |  | (11,243 | ) |  | (5,637 | ) |  | (4,403 | )
Net loss per common share, basic and diluted | (0.36 | ) |  | (0.40 | ) |  | (0.20 | ) |  | (0.14 | )
Shares used to compute net loss per common share, basic and diluted | 27,817,993 |  |  | 27,859,918 |  |  | 27,916,819 |  |  | 31,705,603 |
2015: |  |  |  |  |  |  |  |  |  |  |
Revenue | $ | 11,218 |  |  | $ | 11,908 |  |  | $ | 12,335 |  |  | $ | 14,042 |
Net loss | (7,610 | ) |  | (9,136 | ) |  | (8,945 | ) |  | (8,013 | )
Net loss per common share, basic and diluted | (0.34 | ) |  | (0.35 | ) |  | (0.32 | ) |  | (0.29 | )
Shares used to compute net loss per common share, basic and diluted | 22,539,723 |  |  | 26,048,934 |  |  | 27,640,806 |  |  | 27,672,806 |

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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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