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Debt, Commitments and Contingencies - Schedule of Future Principal Payments for Term Loan and Final Payment (Detail) - Silicon Valley Bank and Solar Capital, Ltd. [Member]
$ in Thousands
Jun. 30, 2017
USD ($)
Debt Instrument [Line Items]  
2017 $ 370
2018 4,628
2019 5,023
2020 6,292
Future principal payments for term loan and final payment, total $ 16,313