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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of disaggregated revenue

The following table presents our revenues disaggregated by type and percentage of total revenues for the periods indicated.

		Year Ended December 31,
		2018							2017							2016
		Revenue				Percentage of Total Revenue			Revenue				Percentage of Total Revenue			Revenue				Percentage of Total Revenue
Sand sales revenue		$	121,377			57	%		$	50,200			37	%		$	17,076			29	%
Reservation charges		22,156				10	%		30,000				22	%		15,041				25	%
Shortfall payments		6,032				3	%		1,244				1	%		20,902				35	%
Railcar usage revenue		8,918				4	%		7,702				5	%		5,732				10	%
Transportation revenue		53,987				26	%		48,066				35	%		480				1	%
Total revenues		$	212,470			100	%		$	137,212			100	%		$	59,231			100	%

Schedule of useful lives of property, plant and equipment

Depreciation is calculated using the straight-line method over the estimated useful lives of the property, plant and equipment, which are:

	Years
Land improvements	10
Plant and buildings	5-15
Real estate properties	10-40
Railroad and sidings	30
Vehicles	3-5
Machinery, equipment and tooling	3-15
Wellsite proppant storage solutions	5-15
Furniture and fixtures	3-10
Deferred mining costs	3

The acquisition cost has been allocated over the assets as set forth below.

Machinery, equipment and tooling	$	1,478
Plant and building	1,407
Railroad and sidings	9,926
Land improvements	2,738
Total assets acquired	$	15,549

Net property, plant and equipment consists of:

	December 31,
	2018				2017
Machinery, equipment and tooling	$	14,858			$	7,802
Wellsite proppant storage solutions	5,286				—
Vehicles	1,955				1,546
Furniture and fixtures	1,140				720
Plant and building	158,882				81,561
Real estate properties	4,601				4,432
Railroad and sidings	27,347				10,254
Land and land improvements	27,167				16,378
Asset retirement obligation	16,469				8,408
Mineral properties	10,075				9,878
Deferred mining costs	1,806				657
Construction in progress	21,619				56,493
	291,205				198,129
Less: accumulated depreciation and depletion	42,809				26,367
Total property, plant and equipment, net	$	248,396			$	171,762

Schedule of contingent consideration

The fair value of the Company’s financial instruments carried at fair value were as follows:

		December 31, 2018				Level 1				Level 2				Level 3
Contingent consideration		$	7,167			$	—			$	—			$	7,167
Total liabilities		$	7,167			$	—			$	—			$	7,167

Fair value, liabilities measured on recurring basis, unobservable input reconciliation

The following table provides a summary of changes in the fair value of the Company’s Level 3 financial instruments for the year ended December 31, 2018:

Balance as of January 1, 2018		$	—
Contingent consideration pursuant to acquisition		9,200
Payment of contingent consideration		(175		)
Fair value adjustment		(1,858		)
Balance as of December 31, 2018		$	7,167

Reconciliation of weighted-average common shares outstanding used in the calculation of basic and diluted net income (loss) per share

The following table reconciles the weighted-average common shares outstanding used in the calculation of basic net income per share to the weighted average common shares outstanding used in the calculation of diluted net income per share:

	Year Ended December 31,
	2018			2017			2016
Determination of Shares
Weighted average common shares outstanding	40,427			40,208			24,322
Assumed conversion of restricted stock	22			96			257
Diluted weighted average common stock outstanding	40,449			40,304			24,579

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