Income Taxes - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Apr. 23, 2019	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Income tax refunds			$ 300	$ 200
Pretax income (loss) including permanently excludable loss			$ 8,700	(54,600)
Period to carry forward general business credits			20 years
Net deferred tax liability			$ 1,105	647
Tax credit carryforwards			6,300
Federal net operating loss carryforwards			11,400
State net operating loss carryforwards			5,000
Income tax benefit			(409)	(169)
Subsequent Event
Income Tax Contingency [Line Items]
Income tax benefit		$ 800
Share Purchase Agreement, Second Amended And Restated Warrant | Series B Convertible Preferred Stock
Income Tax Contingency [Line Items]
Exercise of private placement warrants (in shares)	4,049,759
Percent ownership of outstanding common stock	51.50%
Private placement warranty liability
Income Tax Contingency [Line Items]
Permanently excludable loss associated with change in valuation of warrants			$ 1,400	$ 10,400