Annual report pursuant to Section 13 and 15(d)

Convertible Notes Payable - Reconciliation of Principal Amounts of Acacia Note and the Bridge Loan to Convertible Notes Payable (Detail)

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Convertible Notes Payable - Reconciliation of Principal Amounts of Acacia Note and the Bridge Loan to Convertible Notes Payable (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]  
Debt discounts associated with stock warrants, net $ (6,793)
Debt issuance costs, net (105)
Accrued interest 286
Convertible note payable 13,388
First Loans [Member]  
Debt Instrument [Line Items]  
Borrowings 10,000
Second Loans [Member]  
Debt Instrument [Line Items]  
Borrowings $ 10,000