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Stock Compensation and Unit-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions				12 Months Ended		18 Months Ended
	Jan. 01, 2019	Jun. 21, 2018	Jun. 20, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unit-based compensation, additional vesting period				3 years
Number of units, granted				2,146,699
Options initial exercise price				$ 8.53	$ 14.89	$ 8.53
Fair market value per share of common stock				$ 1.59		$ 1.59
Unrecognized compensation cost related to equity awards				$ 7.9		$ 7.9
Unrecognized compensation expected to be recognized				3 years
Selling, General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense				$ 2.7	$ 4.6
Research and Development Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense				1.1	2.8
Cost of Goods Sold
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense				$ 0.1	$ 0.2
Employees and Consultants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period				4 years
Non-employee Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period				12 months
2018 Omnibus Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Plan terms				On June 21, 2018, the Company adopted the 2018 Omnibus Equity Incentive Plan (“Plan”). This plan reserved 6.2 million shares with an increase to be added annually beginning in 2019 through 2028 up to 4% of the total number of shares of common stock issued and outstanding on a fully diluted basis as of the end of the immediately preceding fiscal year, providing that the aggregate number of additional shares shall not exceed a total of 45 million shares, and a maximum of 40 million shares pursuant to the exercise of stock options.
Shares reserved for future issuance	6,900,000	6,200,000
Maximum number of shares issuable under the plan, in proportion to common stock, percentage		4.00%
Stock options, contractual life		10 years
Number shares available to be awarded under the plan				2,120,000		2,120,000
2018 Omnibus Equity Incentive Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number additional shares allowed under the plan		45,000,000
Maximum number additional shares allowed pursuant to exercise of stock options under the plan		40,000,000
Restricted Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards, outstanding				1,345,231	185,571	1,345,231
Awards, forfeited					2,521
Awards, granted					0
Restricted Stock Awards \| Employees and Consultants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period				4 years
Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period				2 years
2019 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares reserved	300,000
2019 Employee Stock Purchase Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number additional shares allowed under the plan	4,500,000
Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Units issued converted into common stock shares						23,470,035
Stock compensation expense not yet recognized				$ 7.8		$ 7.8
Common Stock \| Common Stock Awards that Vest at the Time of Issuance
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense not yet recognized				3.8		3.8
Common Stock \| Common Stock Awards that Did Not Vest Immediately
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense not yet recognized				0.4		0.4
Common Stock \| Options to Purchase Common Stock that Did Not Vest Immediately
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense not yet recognized				$ 3.6		$ 3.6
Profits Interests
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units, granted					19,447,218
Number of units, forfeited			110,354
Options initial exercise price				$ 15.00		$ 15.00
Profits Interests \| Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Units issued converted into common stock shares				1,345,231	1,345,231	1,345,231
Options to purchase common stock shares				2,141,748
Options initial exercise price				$ 15.00		$ 15.00
Profits Interests \| Common Stock \| IPO
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Units issued converted into common stock shares				62,765,605
Stock compensation expense not yet recognized				$ 2.8		$ 2.8
Profits Interests \| Common Stock \| IPO \| Common Stock Awards that Vest at the Time of Issuance
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense not yet recognized				1.2		1.2
Profits Interests \| Common Stock \| IPO \| Common Stock Awards that Did Not Vest Immediately
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense not yet recognized				0.2		0.2
Profits Interests \| Common Stock \| IPO \| Options to Purchase Common Stock that Did Not Vest Immediately
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense not yet recognized				$ 1.4		$ 1.4
One Year Anniversary
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unit-based compensation, vesting rights percentage				25.00%
Options Vested Immediately \| Profits Interests
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of vested stock option				1,157,139
Options Vesting of 25% on January 1, 2019 and Balance Over Next Succeeding 10 Calendar Quarters \| Profits Interests
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of vested stock option				188,092
Options Vesting on January 1, 2019 \| Profits Interests
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unit-based compensation, vesting rights percentage				100.00%
Number of vested stock option				228,954
Options Vesting 25% on January 1, 2019, Remaining Vesting Over The Next 14 Quarters \| Profits Interests
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unit-based compensation, vesting rights percentage				25.00%
Number of vested stock option				1,912,797