Quarterly report pursuant to Section 13 or 15(d)

Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details)

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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Prepaid Expense And Other Assets Current [Abstract]    
Prepaid research and development expenses $ 5,143 $ 5,351
Prepaid insurance 1,130 438
Short-term deposits 780 959
Research and development tax credit receivable 350 404
Value added tax receivable 293 159
Other prepaid assets 160 921
Interest receivable 97 158
Total $ 7,953 $ 8,390