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Income Taxes - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($)
Income Tax Disclosure [Line Items]
Cumulative-effect adjustment to increase gross deferred tax assets and related valuation allowance against deferred tax assets	$ 3,485,000
Valuation allowance, deferred tax assets	$ 32,759,000
Converpower Corporation [Member]
Income Tax Disclosure [Line Items]
Ownership percentage by parent in certain operating assets and cash	100.00%
Unremitted earnings reversed	$ 55,000

X

- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

+ References

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X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319

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- Definition

Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 25
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28446-109314

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 25
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28511-109314

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Income Tax Disclosure [Line Items]

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- Definition

Ownership percentage by parent in certain operating assets and cash.

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