Related Party Transactions Related Party Transactions (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Jul. 17, 2020	Feb. 29, 2020
Related Party Transaction [Line Items]
Maximum Ownership Mr Glaser Can Have	38.50%
Future Issuance Of Equity, Liability	$ 2,106	$ 2,106
Percentage of ownership interest in Rhapsody	82.00%
Mr. Glaser Member
Related Party Transaction [Line Items]
Additional funding in exchange for preferred stock		$ 800
Future Issuance Of Equity, Liability			$ 700
Outside Investors
Related Party Transaction [Line Items]
Future Issuance Of Equity, Liability			$ 1,400
Series B Preferred Stock
Related Party Transaction [Line Items]
Additional funding in exchange for preferred stock				$ 10,000
Preferred stock, shares issued	8,065,000	8,065,000		8,064,516