Stock-Based Compensation - Options (Details) - 2018 Plan - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		12 Months Ended
	Jan. 17, 2018	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Unrecognized compensation expense
Unrecognized compensation expense		$ 5.1
Selling, general and administrative expense
Unrecognized compensation expense
Total compensation expense		$ 0.9	$ 2.8
Stock options
Stock-based compensation
Minimum fair market value per share of underlying stock used to determine option grant price, as a percent	100.00%
Expiration of stock options	10 years
Outstanding
Outstanding Balance at beginning of the year (in shares)		4,937,700
Forfeited (in shares)		(79,000)
Outstanding Balance at the end of the year (in shares)		4,858,700		4,937,700
Weighted Average Exercise Price
Outstanding Balance at the beginning of the year		$ 4.14
Outstanding Balance at the end of the year (in shares)		4.14		$ 4.14
Weighted average Grant Date fair Value
Outstanding balance at the beginning of the period		1.97
Forfeited		2.69
Outstanding balance at the end of the period		$ 1.96		$ 1.97
Additional information
Average Remaining Vesting Period		2 years 11 days		2 years 3 months 7 days
Stock options | Minimum
Stock-based compensation
Vesting period		2 years
Stock options | Maximum
Stock-based compensation
Vesting period		4 years