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Commitments and Contingencies - Additional Information (Detail) $ / shares in Units, € in Millions |  |  |  |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 19, 2018 USD ($) $ / shares shares | Apr. 05, 2018 USD ($) $ / shares shares | Nov. 29, 2017 USD ($) | Oct. 23, 2017 shares | May 05, 2017 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 EUR (€) | Jun. 30, 2018 USD ($) Vehicle | Mar. 31, 2018 USD ($) | Mar. 31, 2019 EUR (€) | Jan. 01, 2019 USD ($) | Jul. 01, 2013 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase commitment amount under insulin supply agreement | € |  |  |  |  |  |  | € 90.3 |  |  |  |  |
Long term purchase commitment remaining amount | € |  |  |  |  |  |  |  |  |  | € 84.1 |  |
Supply Agreement expiration period |  |  |  |  |  | Dec. 31, 2024 | Dec. 31, 2024 |  |  |  |  |
Supply Agreement renewal period |  |  |  |  |  | 2 years | 2 years |  |  |  |  |
Operating lease, non-current liabilities |  |  |  |  |  | $ 3,615,000 |  |  |  |  |  |
Operating lease costs |  |  |  |  |  | 500,000 |  |  |  |  |  |
Operating lease, cash paid |  |  |  |  |  | 500,000 |  |  |  |  |  |
Variable lease costs |  |  |  |  |  | $ 100,000 |  |  |  |  |  |
Operating lease, weighted average discount rate |  |  |  |  |  | 7.20% |  |  |  | 7.20% |  |
Operating lease, weighted-average remaining lease term |  |  |  |  |  | 3 years 9 months 18 days |  |  |  | 3 years 9 months 18 days |  |
Vehicle Leases | Lease Agreement with Enterprise |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vehicle leases | Vehicle |  |  |  |  |  |  |  | 118 |  |  |  |
Operating lease rent expenses |  |  |  |  |  |  |  | $ 83,000 |  |  |  |
Lease expiration date |  |  |  |  |  |  |  | 48 months |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  |  |  |  |  | $ 1,600,000 |
Operating lease liabilities |  |  |  |  |  | $ 1,300,000 |  |  |  |  | 1,600,000 |
Operating lease, current assets |  |  |  |  |  | 1,600,000 |  |  |  |  |  |
Operating lease, other current liabilities |  |  |  |  |  | 600,000 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | shares |  |  |  | 973,236 |  |  |  |  |  |  |  |
Purchase Agreements |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock purchase agreements date |  | Apr. 05, 2018 |  |  |  |  |  |  |  |  |  |
Warrant expiration date |  | Apr. 09, 2019 |  |  |  |  |  |  |  |  |  |
Purchase Agreements | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | shares |  | 14,000,000 |  |  |  |  |  |  |  |  |  |
Amount of net proceeds from issuance of securities |  | $ 26,400,000 |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  | $ 2.00 |  |  |  |  |  |  |  |  |  |
Purchase Agreements | Warrants |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase of common stock | shares |  | 14,000,000 |  |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares |  | $ 2.38 |  |  |  |  |  |  |  |  |  |
Deerfield | Milestone Rights Liability | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability for milestone payments |  |  |  |  |  | $ 90,000,000 |  |  |  |  |  | $ 90,000,000
Leerink Partners LLC | Underwriting Agreement |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock purchase agreements date | Dec. 26, 2018 |  |  |  |  |  |  |  |  |  |  |
Warrant expiration date | Dec. 26, 2019 |  |  |  |  |  |  |  |  |  |  |
Leerink Partners LLC | Underwriting Agreement | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | shares | 26,666,667 |  |  |  |  |  |  |  |  |  |  |
Amount of net proceeds from issuance of securities | $ 37,300,000 |  |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares | $ 1.50 |  |  |  |  |  |  |  |  |  |  |
Leerink Partners LLC | Underwriting Agreement | Warrants |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase of common stock | shares | 26,666,667 |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares | $ 1.60 |  |  |  |  |  |  |  |  |  |  |
Russell Ranch Road II LLC | Office Lease |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating lease rent expenses |  |  | $ 35,969 |  | $ 40,951 |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  |  |  |  |  | 3,200,000 |
Operating lease liabilities |  |  |  |  |  |  |  |  |  |  | 3,500,000 |
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 |  |  |  |  |  |  |  |  |
Maintenance fee of common area |  |  | $ 0 |  |  |  |  |  |  |  |  |
Operating lease, current liabilities |  |  |  |  |  |  |  |  |  |  | 900,000 |
Operating lease rent expenses |  |  |  |  |  |  |  |  | $ 100,000 |  |  |
Operating lease, non-current liabilities |  |  |  |  |  |  |  |  |  |  | $ 2,600,000 |

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