Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses and Other Long-Term Liabilities - Additional Information (Detail)

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Accrued Expenses and Other Long-Term Liabilities - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule Accrued Expenses And Other Long-Term Liabilities [Line Items]    
Estimated Litigation Liability, Current [1] $ 2,212 $ 0
Mustang Common Shares [Member]    
Schedule Accrued Expenses And Other Long-Term Liabilities [Line Items]    
Number of Shares To Be Issued Upon Legal Settlement 200,000  
[1] In connection with a legal settlement (see Note 16), the Company is required to deliver 200,000 Mustang common shares, held by the Company, to the Plaintiff. At September 30, 2017, the Company recorded, this settlement as an accrued, since in accordance with ASC 450 – Contingencies, the transfer of the consideration was probable. As such the Company recorded an accrued expense of $2.0 million representing the value of the shares transferred.