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Licensing and Other Arrangements - Novartis International (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 item | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2019 USD ($)
Licensing and other arrangements |  |  |  |  |  |
Revenue from contracts with customers |  | $ 500 | $ 8,026 |  |  |
Novartis International | License Agreement |  |  |  |  |  |
Licensing and other arrangements |  |  |  |  |  |
Agreement termination prior written notice period | 180 days |  |  |  |  |
Number of performance obligations | item | 1 |  |  |  |  |
Revenue from contracts with customers |  | 0 | $ 0 | $ 10,000 | $ 37,000 |
Maximum eligible milestone payments receivable upon achievement of development, regulatory and commercial milestones |  | 470,000 |  |  |  |
Royalty payment period | 10 years |  |  |  |  |
Contract assets |  | 0 |  |  |  | $ 0
Contract liabilities |  | 0 |  |  |  | 0
Capitalized contract costs |  | $ 0 |  |  |  | $ 0

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044 + Details
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