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Revenue - Revenue from contracts with customers (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Sep. 30, 2018 USD ($) customer | Sep. 30, 2018 USD ($) customer | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) item customer | Sep. 30, 2017 USD ($)
Disaggregation of revenue |  |  |  |  |  |
Total Revenue |  |  | $ 40,792,000 | $ 27,185,000 | $ 58,026,000 | $ 33,563,000
Change in contract with customer, liability |  |  |  |  |  |
Deferred revenue | $ 30,090,000 | $ 1,345,000 | 1,345,000 |  | 1,345,000 |
Revenue recognized in the period |  |  |  |  | 1,787,000 |
Changes in variable consideration |  |  | 0 |  | (10,396,000) |
Changes in percentage of completion |  |  | 45,000 |  | 5,027,000 |
Contract assets, liability and receivables |  |  |  |  |  |
Remaining performance obligation |  | 1,345,000 | 1,345,000 |  | 1,345,000 |
NY-ESO program |  |  |  |  |  |
Contract assets, liability and receivables |  |  |  |  |  |
Remaining performance obligation |  | 88,000 | 88,000 |  | 88,000 |
PRAME program |  |  |  |  |  |
Contract assets, liability and receivables |  |  |  |  |  |
Remaining performance obligation |  | 1,257,000 | 1,257,000 |  | 1,257,000 |
Under previous revenue guidance | ASU 2014-09 |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |
Total Revenue |  |  | 56,999,000 |  | 69,262,000 |
Development revenue |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |
Total Revenue |  |  | 1,678,000 | $ 27,185,000 | 18,912,000 | $ 33,563,000
License revenue |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |
Total Revenue |  |  | $ 39,114,000 |  | $ 39,114,000 |
License revenue | NY-ESO program |  |  |  |  |  |
Change in contract with customer, liability |  |  |  |  |  |
Revenue recognized in the period |  | $ 39,114,000 |  |  |  |
Revenue recognized included in contract liability at beginning of the period | $ 27,001,000 |  |  |  |  |
GlaxoSmithKline Intellectual Property Development Ltd |  |  |  |  |  |
Contract assets, liability and receivables |  |  |  |  |  |
Number of customers | customer |  | 1 | 1 |  | 1 |
Number of geographic locations | item |  |  |  |  | 1 |

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