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Segment Reporting - Financial Information with Respect to Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 5,389 | $ 1,874 | $ 10,851 | $ 3,402
Total allocation of centralized research and development operational cash expenditures | 22,760 | 10,869 | 42,721 | 18,986
Loss from operations | (23,871) | (12,125) | (43,365) | (21,360)
Adjustments to reconcile segment operating loss to consolidated loss from operations: |  |  |  |
Interest income received | (1,485) | (299) | (2,086) | (522)
Depreciation and amortization |  |  | (2,107) | (970)
Share-based compensation |  |  | (3,828) | (405)
Loss on disposal of assets |  |  | (22) | (8)
Changes in prepaids, accounts payable and accrued expenses | 6,884 | (2,491) | 10,809 | 2,906
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  |  | 10,851 | 3,402
Total segment operational cash expenditures | 16,949 | 5,600 | 31,966 | 15,909
Total allocation of centralized research and development operational cash expenditures | 3,118 | 2,721 | 6,871 | 5,175
Loss from operations | (14,678) | (6,447) | (27,986) | (17,682)
Operating Segments | Therapeutics |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 4,819 | 1,447 | 9,638 | 2,894
Total segment operational cash expenditures | 14,872 | 4,926 | 27,782 | 14,176
Total allocation of centralized research and development operational cash expenditures | 3,118 | 1,905 | 6,871 | 3,942
Loss from operations | (13,171) | (5,384) | (25,015) | (15,224)
Operating Segments | Food |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 570 | 427 | 1,213 | 508
Total segment operational cash expenditures | 2,077 | 674 | 4,184 | 1,733
Total allocation of centralized research and development operational cash expenditures |  | 816 |  | 1,233
Loss from operations | (1,507) | (1,063) | (2,971) | (2,458)
Segment Reconciling Items |  |  |  |
Adjustments to reconcile segment operating loss to consolidated loss from operations: |  |  |  |
Corporate general and administrative cash expenditures | (11,123) | (2,118) | (18,145) | (4,677)
Interest income received | (1,485) | (299) | (2,086) | (522)
Depreciation and amortization | (1,168) | (512) | (2,107) | (970)
Share-based compensation | (2,279) | (255) | (3,828) | (405)
Loss on disposal of assets | $ (22) | $ (3) | $ (22) | $ (10)

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