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Supplemental Balance Sheet Information - Accrued Expense and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Supplemental Balance Sheet Information [Abstract]    
Accrued legal expenses $ 514 $ 251
Accrued payroll-related expenses 329 718
Other accrued expenses 422 304
Accrued expenses and other current liabilities $ 1,265 $ 1,273