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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Revenues: |  |
Revenue from contracts with customers | $ 500 | $ 8,026
Revenue recognized under units-of-revenue method | 304 | 105
Total revenues | 804 | 8,131
Operating expenses: |  |
Research and development | 62 | 256
General and administrative | 6,358 | 5,939
Total operating expenses | 6,420 | 6,195
(Loss) income from operations | (5,616) | 1,936
Other (expense) income, net: |  |
Interest expense | (542) | (429)
Other (expense) income, net | (126) | 1,726
(Loss) income before income tax | (6,284) | 3,233
Income tax benefit | 1,526 |
Net (loss) income and comprehensive (loss) income | (4,758) | 3,233
Net (loss) income and comprehensive (loss) income available to common stockholders, basic | (4,758) | 1,881
Net (loss) income and comprehensive (loss) income available to common stockholders, diluted | $ (4,758) | $ 1,935
Basic net (loss) income per share available to common stockholders | $ (0.49) | $ 0.22
Diluted net (loss) income per share available to common stockholders | $ (0.49) | $ 0.21
Weighted average shares used in computing basic net (loss) income per share available to common stockholders | 9,761 | 8,706
Weighted average shares used in computing diluted net (loss) income per share available to common stockholders | 9,761 | 9,324

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