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Quarterly financial data (unaudited) | 12 Months Ended
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Dec. 31, 2018
Quarterly financial data (unaudited) |
Quarterly financial data (unaudited) | 20. Quarterly financial data (unaudited) Summarized unaudited quarterly financial data for fiscal years 2018 and 2017 are as follows:
|  | Quarter Ended
2018 |  | March 31 |  | June 30 |  | September 30 |  | December 31
Revenue |  | $ | 58,159 |  | $ | 59,601 |  | $ | 65,253 |  | $ | 67,808
(Loss) income from operations |  | $ | (2,566) |  | $ | 2,576 |  | $ | 150 |  | $ | (3,157)
Net (loss) income attributable to common stockholders |  | $ | (3,229) |  | $ | 2,115 |  | $ | (522) |  | $ | 416
Basic and diluted (loss) income per share |  | $ | (0.08) |  | $ | 0.05 |  | $ | (0.01) |  | $ | 0.01
|  | Quarter Ended
2017 |  | March 31 |  | June 30 |  | September 30 |  | December 31
Revenue |  | $ | 44,333 |  | $ | 49,033 |  | $ | 53,655 |  | $ | 57,348
Loss from operations |  | $ | (6,578) |  | $ | (7,670) |  | $ | (2,989) |  | $ | (3,464)
Net loss attributable to common stockholders |  | $ | (6,880) |  | $ | (8,017) |  | $ | (3,450) |  | $ | (1,019)
Basic and diluted loss per share |  | $ | (0.18) |  | $ | (0.20) |  | $ | (0.09) |  | $ | (0.02)
Losses per share are computed separately for each quarter and the full year using the respective weighted average number of shares. Therefore, the sum of the quarterly losses per share amounts may not equal the annual amounts reported.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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