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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 22, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 6.3	$ 6.5	$ 1.2
Employer matching contribution in relation to gross pay (as a percent)	6.00%
Employer matching contributions	$ 0.7	$ 0.3	$ 0.1
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized	$ 0.3
Period for recognition of compensation not yet recognized	2 months 27 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized	$ 3.7
Period for recognition of compensation not yet recognized	1 year 9 months 22 days
Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized	$ 2.9
Period for recognition of compensation not yet recognized	1 year 7 months 6 days
Cash-Settled Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized	$ 0.4
Period for recognition of compensation not yet recognized	2 years 1 month 13 days
Liability for cash-settled restricted stock units	$ 0.2
Closing price (USD per share)	$ 1.28
Long-Term Incentive Plan \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issuance authorized (shares)				7,500,000
Stock available for issuance (shares)	4,038,589
Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution (as a percent)	100.00%	100.00%
Employer matching contribution in relation to gross pay (as a percent)		3.00%
Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution (as a percent)		50.00%
Tranche Two \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution in relation to gross pay (as a percent)		3.00%
Tranche Two \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution in relation to gross pay (as a percent)		5.00%