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] - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]    
Principal payments due under the loan facility $ 9,014 $ 10,000
Less: unamortized debt discount (599) (929)
Plus: accreted value of final payment 383 237
Term loan facility, net $ 8,798 $ 9,308