Annual report pursuant to Section 13 and 15(d)

Facility Loans - Schedule of Term Loan Facility, Debt Discounts and Final Payment (Detail)

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Facility Loans - Schedule of Term Loan Facility, Debt Discounts and Final Payment (Detail) - 2015 Term Loan Facility [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Line of Credit Facility [Line Items]  
Principal payments due under the loan facility $ 5,877
Less: unamortized debt discount (296)
Plus: accreted value of final payment 517
Term loan facility, net $ 6,098