Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Valuation Allowance, Deferred Tax Asset
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation allowances and reserves, beginning balance	$ 820	$ 205
Valuation allowances and reserves, charged to costs and expenses	1,442	1,368
Valuation allowances and reserves, deductions	(510)	(753)
Valuation allowances and reserves, ending balance	1,752	820
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation allowances and reserves, beginning balance	$ 310	81
Valuation allowances and reserves, charged to costs and expenses		229
Valuation allowances and reserves, deductions		0
Valuation allowances and reserves, ending balance		$ 310