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Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accrued Liabilities Current [Abstract]    
Research and clinical expenses $ 14,846 $ 10,068
Payroll and related expenses 4,823 4,526
Legal and professional expenses 1,328 1,523
Other accrued expenses 419 265
Total $ 21,416 $ 16,382 [1]
[1] The condensed balance sheet as of December 31, 2017 was derived from the audited financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017.