Summary of Significant Accounting Policies - Additional Information (Details)			3 Months Ended				9 Months Ended		12 Months Ended
	Mar. 27, 2020 USD ($)	Mar. 26, 2020	Sep. 30, 2020 USD ($) shares	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($) shares	Sep. 30, 2020 USD ($) segment shares	Sep. 30, 2019 USD ($) shares	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Significant Accounting Policies [Line Items]
Number of Reportable Segments | segment							1
Options and warrants excluded from the calculation of diluted shares | shares			7,043,259			4,807,377	7,043,259	4,807,377
Additional tax benefit related to the alternative minimum tax refund				$ 380,000
Operating Loss Carryforwards			$ 45,700,000				$ 45,700,000
Deferred Tax Assets, Valuation Allowance											$ 11,300,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount							18,000,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			39,000			$ 2,667,000	(460,000)	$ (15,169,000)
Goodwill impairment loss							0		$ 0
Cylinder deposit liability							10,400,000		9,500,000
Operating Lease, Right-of-Use Asset			6,719,000				6,719,000		$ 8,048,000
Operating Lease, Liability			6,793,000				6,793,000
No Expiration [Member]
Significant Accounting Policies [Line Items]
Operating Loss Carryforwards			39,300,000				39,300,000
Expiration Through 2023
Significant Accounting Policies [Line Items]
Operating Loss Carryforwards			5,400,000				5,400,000
State and Local Jurisdiction [Member]
Significant Accounting Policies [Line Items]
Operating Loss Carryforwards			23,600,000				$ 23,600,000
ASU Topic 842 [Member]
Significant Accounting Policies [Line Items]
Operating Lease, Right-of-Use Asset										$ 8,100,000
Operating Lease, Liability										$ 8,100,000
Customer Concentration Risk [Member] | One Customer | Revenue from Contract with Customer [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage							13.00%	13.00%
Customer Concentration Risk [Member] | One Customer | Accounts Receivable
Significant Accounting Policies [Line Items]
Accounts Receivable, net			2,000,000			$ 3,300,000	$ 2,000,000	$ 3,300,000
CARES Act
Significant Accounting Policies [Line Items]
Percent of taxable income offset for taxable years beginning before 2021	100.00%
Preliminary tax benefit related to the alternative minimum tax refund					$ 47,000
Percent of adjusted taxable income	50.00%	30.00%
Increase in allowable interest expense	$ 2,231,000
Operating Loss Carryforwards			$ 2,231,000				$ 2,231,000