Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 465
Charged to Costs & Expenses	$ 35	0
Charged to Other Accounts	0	0
Accounts Written Off or Deductions	0	465
Balance at End of Period	35
Deferred tax valuation allowance
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	15,167	7,890
Charged to Costs & Expenses	0	0
Charged to Other Accounts	14,036	7,277
Accounts Written Off or Deductions	0	0
Balance at End of Period	$ 29,203	$ 15,167