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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Revenue |  |  |  |
Revenue from external customers | $ 8,847 | $ 12,739 | $ 29,782 | $ 41,035
Revenue from related party | 1,332 | 0 | 1,332 | 0
Total revenues | 10,179 | 12,739 | 31,114 | 41,035
Costs and expenses: |  |  |  |
Operating expenses (excluding depreciation and amortization) | 5,418 | 29,466 | 31,330 | 63,939
Corporate general and administrative | 2,696 | 2,679 | 9,925 | 12,568
Depreciation and amortization | 233 | 518 | 793 | 3,177
Research and development | 1,186 | 1,480 | 4,194 | 5,673
Loss (Gain) on disposal of long-lived assets | 14 | (37) | (55) | (92)
Impairment of goodwill | 0 | 11,706 | 0 | 11,706
Impairment of fixed, long-lived and intangible assets | 0 | 12,521 | 0 | 69,975
Total costs and expenses | 9,547 | 58,333 | 46,187 | 166,946
Income (loss) from operations | 632 | (45,594) | (15,073) | (125,911)
Other (expense) income: |  |  |  |
Paycheck protection plan loan forgiveness | 0 | 0 | 881 | 0
Gain on lease termination | 0 | 0 | 0 | 576
Interest expense | (18) | (19) | (53) | (40)
Other (expense) income, net | (102) | 291 | (62) | 322
Total other (expense) income, net | (120) | 272 | 766 | 858
Income (loss) before income taxes | 512 | (45,322) | (14,307) | (125,053)
Income tax (expense) benefit | (3) | 81 | (30) | 6,282
Net income (loss) | $ 509 | $ (45,241) | $ (14,337) | $ (118,771)
Income (loss) per common share: |  |  |  |
Basic (in dollars per share) | $ 0.01 | $ (0.66) | $ (0.21) | $ (1.75)
Diluted (in dollars per share) | $ 0.01 | $ (0.66) | $ (0.21) | $ (1.75)
Weighted average common shares: |  |  |  |
Weighted average common shares used in computing basic income (loss) per common share (in shares) | 69,324 | 68,217 | 68,665 | 68,063
Weighted average common shares used in computing diluted income (loss) per common share (in shares) | 70,176 | 68,217 | 68,665 | 68,063

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