Summary of Significant Accounting Policies (Narrative) (Details)		3 Months Ended				12 Months Ended
	Oct. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) reporting_unit shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2020
Summary of Significant Accounting Policies [Line Items]
Restricted cash		$ 20,183,000				$ 19,615,000	$ 20,183,000	$ 6,102,000
Certificates of deposit						100,000
Capitalized internally developed software costs						15,000,000.0	11,900,000	9,600,000
Depreciation of capitalized software costs						9,100,000	4,800,000	1,300,000
Capitalized implementation costs		1,000,000.0				$ 3,200,000	1,000,000.0
Number of reporting units | reporting_unit						1
Impairment of goodwill	$ 0	0	$ 0	$ 224,272,000	$ 0	$ 0	224,272,000	$ 0
Impairment of right-of-use and long-lived assets						4,700,000
Impairment of right-of-use assets						2,800,000
Impairment of property and equipment						1,900,000
Proceeds from sale of investment in equity securities						$ 3,800,000
Number of penny warrants issuable (in shares) | shares						250,000
Discount rate | Income approach
Summary of Significant Accounting Policies [Line Items]
ROU assets and leasehold improvements, measurement input									0.12
Minimum
Summary of Significant Accounting Policies [Line Items]
Internal-use software, estimated useful life (in years)						3 years
Leases discount rate						10.60%
Minimum | Subscription Based Revenues | Products and services transferred over time
Summary of Significant Accounting Policies [Line Items]
Revenue, expected performance obligation period						three
Maximum
Summary of Significant Accounting Policies [Line Items]
Internal-use software, estimated useful life (in years)						5 years
Leases discount rate						15.00%
Maximum | Subscription Based Revenues | Products and services transferred over time
Summary of Significant Accounting Policies [Line Items]
Revenue, expected performance obligation period						thirty-six months
Computer software | Minimum
Summary of Significant Accounting Policies [Line Items]
Internal-use software, estimated useful life (in years)						3 years
Computer software | Maximum
Summary of Significant Accounting Policies [Line Items]
Internal-use software, estimated useful life (in years)						5 years
Certificates of Deposit
Summary of Significant Accounting Policies [Line Items]
Restricted cash		$ 1,000,000.0				$ 500,000	$ 1,000,000.0