Summary of Significant Accounting Policies - Additional Information (Details)			3 Months Ended			12 Months Ended
	Mar. 27, 2020 USD ($)	Mar. 26, 2020	Mar. 31, 2021 USD ($) segment shares	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)
Significant Accounting Policies [Line Items]
Number of Reportable Segments | segment			1
Goodwill impairment loss			$ 0			$ 0
Cylinder deposit liability			11,000,000			$ 10,800,000
Additional tax benefit related to the alternative minimum tax refund				$ 380,000
Operating Loss Carryforwards			46,400,000
Deferred Tax Assets, Valuation Allowance							$ 11,300,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			$ 21,000,000
Options and warrants excluded from the calculation of diluted shares | shares			5,329,515		7,042,377
No Expiration [Member]
Significant Accounting Policies [Line Items]
Operating Loss Carryforwards			$ 41,000,000
Expiration Through 2023
Significant Accounting Policies [Line Items]
Operating Loss Carryforwards			5,400,000
State and Local Jurisdiction [Member]
Significant Accounting Policies [Line Items]
Operating Loss Carryforwards			$ 31,200,000
Customer Concentration Risk [Member] | One Customer | Revenue from Contract with Customer [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage			14.00%		13.00%
Customer Concentration Risk [Member] | One Customer | Accounts Receivable
Significant Accounting Policies [Line Items]
Accounts Receivable, net			$ 2,300,000		$ 2,700,000
CARES Act
Significant Accounting Policies [Line Items]
Percent of taxable income offset for taxable years beginning before 2021	100.00%		80.00%
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	$ 593,000
Operating Loss Carryforwards			$ 529,000