Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands		1 Months Ended	12 Months Ended
	Oct. 10, 2017 USD ($)	Jul. 31, 2016	Dec. 31, 2019 USD ($) segment shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($)
Significant Accounting Policies [Line Items]
Number of Reportable Segments | segment			1
Business Combination, Consideration Transferred, Total	$ 209,000
Options and warrants excluded from the calculation of diluted shares | shares			7,042,377	0
Production and importation permission description			22 million pounds in 2015 and was reduced by approximately 4.5 million pounds each year and ended at zero in 2020.
Revenue from Contract with Customer, Including Assessed Tax			$ 162,059	$ 166,525
Operating Loss Carryforwards			$ 46,400
Percentage of tax earnings			80.00%
Annual limitation of NOLs			$ 1,300
Deferred Tax Assets, Valuation Allowance			18,918	11,315
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			18,900
Operating Lease, Liability			8,106
Goodwill impairment loss			0	0	$ 0
Cylinder deposit liability			$ 9,500	11,700
Contract term		5 years
Annual percentage limitation of earnings to which NOLs are subject.			80.00%
Contract renewal term		5 years
Operating Lease, Right-of-Use Asset			$ 8,048	0
No Expiration [Member]
Significant Accounting Policies [Line Items]
Operating Loss Carryforwards			41,000
Expiring Through 2023 [Member]
Significant Accounting Policies [Line Items]
Operating Loss Carryforwards			5,400
The amount of annual loss limitations			1,300
State and Local Jurisdiction [Member]
Significant Accounting Policies [Line Items]
Operating Loss Carryforwards			23,700
Accounting Standards Update 2016-09 [Member]
Significant Accounting Policies [Line Items]
Operating Lease, Liability			8,700
Operating Lease, Right-of-Use Asset			8,100
Financial Service [Member]
Significant Accounting Policies [Line Items]
Revenue from Contract with Customer, Including Assessed Tax			$ 2,300	$ 2,300
Customer Concentration Risk [Member] | One Customer | Revenue from Contract with Customer [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage			14.00%	11.00%
Customer Concentration Risk [Member] | One Customer | Accounts Receivable
Significant Accounting Policies [Line Items]
Accounts Receivable, net			$ 1,800	$ 2,900