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Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 17, 2017 | Jan. 06, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Depreciation and Other Amortization Expenses [Line Items] |  |  |  |  |
Depreciation and amortization expense |  |  | $ 1,800 | $ 2,400 | $ 11,000
Impairment charge |  |  | 200 | 1,300 | 140,600
Property and equipment impairment |  |  | 203 | 1,259 | 140,412
Cash received from property, plant and equipment |  |  | $ 24 | 17 | 82
Property and Equipment Impairment |  |  |  |  |
Depreciation and Other Amortization Expenses [Line Items] |  |  |  |  |
Property and equipment impairment |  |  |  | 700 |
Asset held for sale |  |  |  |  |
Depreciation and Other Amortization Expenses [Line Items] |  |  |  |  |
Impairment charge |  |  |  | 600 |
Danbury Facility |  |  |  |  |
Depreciation and Other Amortization Expenses [Line Items] |  |  |  |  |
Impairment charge |  |  |  |  | $ 138,600
Land, Buildings and Improvements | California |  |  |  |  |
Depreciation and Other Amortization Expenses [Line Items] |  |  |  |  |
Amount of divestiture of long-lived |  | $ 17,300 |  |  |
Cash received from property, plant and equipment | $ 17,300 |  |  |  |
Net cash received from property, plant and equipment |  | 16,700 |  |  |
Payments for commissions and other fees |  | $ 600 |  |  |
Carrying value of the asset held for sale |  |  |  | $ 16,700 |

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