Debt - Schedule of Future Debt Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015
Equity Method Investments And Cost Method Investments [Abstract]
2017	$ 23,032
2018	1,098
Total debt maturities	24,130
Less: debt discount and issuance costs	(186)
Total debt maturities, net of debt discount and issuance costs	23,944
Less: current portion, of long-term debt	(22,846)				$ (2,866)
Long-term debt, net of current portion	$ 1,098	$ 8,496	$ 10,072	$ 11,368	$ 12,887	$ 12,125	$ 13,389	$ 14,609