Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Valuation recorded		$ 19,100
Unrecognized tax benefits	$ 4,924	2,053	$ 1,921	$ 4,924
Decrease due to expiration of statue		452	445
Decrease in federal deferred tax provision upon remeasurement of net deferred taxes at newly enacted rate, provisional estimate	10,100
Federal deferred tax benefit upon remeasurement of valuation allowance at newly enacted rate, provisional estimate	12,600
Federal deferred tax benefit for indefinite lived deferred tax liabilities, provisional estimate	$ 2,000
Percentage of indefinite-lived deferred tax liabilities (percent)	80.00%
State deferred tax provision	$ 1,200	135	$ (28)	(1,144)
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		203,500
Operating loss carryforwards generated in taxable years ending on or before December 31 2017	$ 32,800	41,200		$ 32,800
Net operating loss carryforwards, not subject to expiration		162,300
Operating loss carryforwards, period of carryforward (in years)				20 years
Federal | Expiration between 2023 and 2026
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, subject to expiration		6,000
Federal | Expiration between 2036 and 2037
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, subject to expiration		34,900
Federal | Proficient
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		5,100
Foreign | Australian Taxation Office
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		$ 5,300