Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Amortized cost $ 172,435 $ 292,225
Gross unrealized gains 531 842
Gross unrealized losses (4,105) (2,370)
Estimated fair value 168,861 290,697
Total short-term investments 189,006 321,586
Bank deposits    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 6,231 63,389
Gross unrealized gains 0 13
Gross unrealized losses (50) (21)
Estimated fair value 6,181 63,381
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 4,899 29,308
Gross unrealized gains 0 17
Gross unrealized losses (84) (38)
Estimated fair value 4,815 29,287
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 0 36,008
Gross unrealized gains 0 2
Gross unrealized losses 0 (12)
Estimated fair value 0 35,998
Corporate equity securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 5,807 5,807
Gross unrealized gains 344 402
Gross unrealized losses (3,043) (2,027)
Estimated fair value 3,108 4,182
Mutual fund    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 152,253 152,136
Gross unrealized gains 0 0
Gross unrealized losses (854) (249)
Estimated fair value 151,399 151,887
US government securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 3,245 5,577
Gross unrealized gains 0 0
Gross unrealized losses (74) (23)
Estimated fair value 3,171 5,554
Warrants    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 0 0
Gross unrealized gains 187 408
Gross unrealized losses 0 0
Estimated fair value 187 408
Common Stock    
Debt Securities, Available-for-sale [Line Items]    
Viking common stock $ 20,145 $ 30,889