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Commitments and Contingencies - Additional Information (Detail) € in Millions |  |  |  | 3 Months Ended | 24 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 02, 2018 EUR (€) | Nov. 29, 2017 USD ($) | May 05, 2017 USD ($) | Mar. 31, 2018 USD ($) Vehicle | Mar. 31, 2018 EUR (€) Vehicle | Oct. 01, 2018 USD ($) | Mar. 31, 2018 EUR (€) | Mar. 08, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jul. 01, 2013 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase commitment amount under Insulin Supply Agreement | € |  |  |  |  | € 90.3 |  |  |  |  |
Purchase obligation included in accounts payable |  |  |  |  |  |  |  |  | $ 1,600,000 |
Supply Agreement expiration period |  |  |  | Dec. 31, 2023 | Dec. 31, 2023 |  |  |  |  |
Supply Agreement renewal period |  |  |  | 2 years | 2 years |  |  |  |  |
Annual purchase requirement amount for current year | € |  |  |  |  |  |  | € 8.9 |  |  |
Operating lease rent expenses |  |  |  | $ 100,000 |  |  |  |  |  |
Lease Agreement with Enterprise | Vehicle Leases |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of vehicle leases | Vehicle |  |  |  | 100 | 100 |  |  |  |  |
Operating lease rent expenses |  |  |  | $ 54,000 |  |  |  |  |  |
Lease commencement period |  |  |  | 2018-05 | 2018-05 |  |  |  |  |
Lease expiration period |  |  |  | 48 months | 48 months |  |  |  |  |
Supply Commitment |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase commitment obligation |  |  |  | $ 300,000 |  |  |  |  |  |
Foreign Currency Hedging Transaction | Subsequent Event |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Annual purchase requirement amount for current year | € | € 8.9 |  |  |  |  |  |  |  |  |
Foreign currency hedging transaction renewable period | 90 days |  |  |  |  |  |  |  |  |
Scenario Forecast |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase commitment cancellation fees |  |  |  |  |  | $ 3,400,000 |  |  |  |
Scenario Forecast | Before Amendment |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase commitment cancellation fees |  |  |  |  |  | $ 5,300,000 |  |  |  |
Standby Letter of Credit | Vehicle Leases |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 500,000 |  |
Collateralized amount under letter of credit |  |  |  |  |  |  |  | $ 500,000 |  |
Amount drawn down on letter of credit |  |  |  | 0 |  |  |  |  |  |
Deerfield | Milestone Rights Liability | Maximum |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent liability for milestone payments |  |  |  | $ 90,000,000 |  |  |  |  |  | $ 90,000,000
Russell Ranch Road II LLC |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Operating lease rent expenses |  | $ 35,969 | $ 40,951 |  |  |  |  |  |  |
Percentage of annual increase in lease payment |  | 3.00% | 3.00% |  |  |  |  |  |  |
Lease expiration date |  | Jan. 31, 2023 | Jan. 31, 2023 |  |  |  |  |  |  |
Lease renewal option |  | 5 years | 5 years |  |  |  |  |  |  |
Maximum reimbursable amount for tenant improvements |  | $ 56,325 |  |  |  |  |  |  |  |

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