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
Mar. 31, 2019
Dec. 31, 2018
Prepaid Expense And Other Assets Current [Abstract]    
Prepaid research and development expenses $ 5,315 $ 5,351
Short-term deposits 873 959
Research and development tax credit receivable 395 404
Prepaid insurance 245 438
Interest receivable 151 158
Other prepaid assets 141 921
Value added tax receivable 68 159
Total $ 7,188 $ 8,390