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Estimated percentage of projects completion.

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Line of production facility carrying value.

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Percentage of suspended projects.

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Significant accounting policies.

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Tax cuts and jobs act of 2017 change in provisional amount of income tax expense (benefit) previously recorded.

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

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Amount awarded from other party in judgment or settlement of litigation.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Basis of Presentation - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Significant Accounting Policies [Line Items]
Estimate of projects completed percentage				95.00%
Loss related to settlement		$ 350,000	$ 0	$ 350,000	$ 0
Deferred tax assets, valuation allowance		63,188,000		63,188,000
Change in provisional amount of net deferred tax assets, previously recorded				0
Total restricted cash		9,265,000		9,265,000		$ 10,216,000
Lower of cost or market inventory adjustment				0
Production cost		6,834,000	$ 10,797,000	16,557,000	$ 22,009,000
Russian Proppant
Significant Accounting Policies [Line Items]
Dispute settlement, expense		3,650,000
Loss related to settlement		350,000
Russian Proppant \| Subsequent Event
Significant Accounting Policies [Line Items]
Proceeds from settlement	$ 3,650,000
Share Purchase Agreement \| Russian Proppant
Significant Accounting Policies [Line Items]
Additional proceeds on the sale related to net debt and net working capital purchase price adjustments		$ 4,000,000
Millen, Georgia
Significant Accounting Policies [Line Items]
Carrying value of second line facility				$ 6,753,000
Eufaula and Alabama
Significant Accounting Policies [Line Items]
Percentage of suspended projects relating to assets				66.00%