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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Revenues: |  |
Revenues | $ 13,682 | $ 9,662
Costs and expenses: |  |
Research and development | 48,894 | 47,060
General and administrative | 10,233 | 10,219
Total costs and expenses | 59,127 | 57,279
Loss from operations | (45,445) | (47,617)
Other income | 721 | 2,600
Net loss | (44,724) | (45,017)
Other comprehensive income: |  |
Unrealized gain on investments | 56 | 3
Comprehensive loss | $ (44,668) | $ (45,014)
Basic and diluted net loss per common share (in usd per share) | $ (0.91) | $ (0.99)
Basic and diluted weighted average common shares outstanding (in shares) | 49,012,663 | 45,606,651
Revenue From Collaborative Agreements |  |
Revenues: |  |
Revenues | $ 12,967 | $ 9,497
Revenue From Government Agreements |  |
Revenues: |  |
Revenues | $ 715 | $ 165

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