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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
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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

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