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Fair Value Measurements - Schedule of Change in Valuation of Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |  |
Equity securities and warrants beginning balance | $ 4,668 | $ 2,768 | $ 2,768 | $ 2,768
Purchase of additional common stock |  | 0 | 500 | 0
Investment impairment charges | (4,449) |  | (4,678) |
Equity securities and warrants ending balance | $ 219 | 2,768 | 219 | 2,768
ASU 2016-01 [Member] |  |  |  |
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |  |
Impact on remeasurement of equity investments recorded within other current assets or long term assets |  | $ 0 | $ 1,629 | $ 0

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