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Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended
	Feb. 17, 2017	Jan. 06, 2017	Mar. 31, 2017	Mar. 31, 2016
Depreciation and Other Amortization Expenses [Line Items]
Depreciation and amortization expense			$ 400	$ 600
Cash received from property, plant and equipment			$ 16,651	$ 17
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

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- Definition

Depreciation and Other Amortization Expenses [Line Items]

+ References

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- Definition

Net Proceeds From Sale Of Property

+ References

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- Definition

Payments For Commissions And Other Fees

+ References

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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