Summary of Financial Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total before discount and debt issuance costs	$ 18,490	$ 18,300
Less: Current portion of financial liabilities	(9,957)	(8,119)
Less: Current portion of unamortized discount and debt issuance costs	(596)	(181)
Less: Long-term portion of unamortized discount and debt issuance costs	(1,463)	(221)
Long-term financial liabilities	6,474	9,779
Secured Term Loan
Debt Instrument [Line Items]
Total before discount and debt issuance costs	10,000	10,000
Bank Revolving Loan Facility
Debt Instrument [Line Items]
Total before discount and debt issuance costs	$ 8,490	$ 8,300