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Development and License Agreements - Summary of Prepaid R&D Asset and Manufacturing Efficiency Asset (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Other current assets |  |  |
Deferred Costs Capitalized Prepaid And Other Assets [Line Items] |  |  |
Prepaid R&D asset | [1] | $ 46 | $ 47
Other assets |  |  |
Deferred Costs Capitalized Prepaid And Other Assets [Line Items] |  |  |
Prepaid R&D asset | [2] | 2,152 | 2,156
Manufacturing efficiency asset | [2] | $ 1,472 | $ 1,594
[1] | Included in “Other current assets” in the Company's condensed consolidated balance sheets.
[2] | Included in “Other assets” in the Company's condensed consolidated balance sheets

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