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Fair Value Measurements - Summary of Fair Values (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Assets:
Available-for-Sale Investments		$ 0
Liabilities:
Common Stock Warrants	$ 6,293,000	178,232,000
Fair Value, Recurring
Assets:
Available-for-Sale Investments	528,902,000
Liabilities:
Total liabilities	6,293,000	178,232,000
Fair Value, Recurring | Asset backed securities
Assets:
Available-for-Sale Investments	111,552,000
Fair Value, Recurring | Certificates of deposits
Assets:
Available-for-Sale Investments	6,002,000
Fair Value, Recurring | Corporate notes and bonds
Assets:
Available-for-Sale Investments	206,989,000
Fair Value, Recurring | Commercial paper
Assets:
Available-for-Sale Investments	109,391,000
Fair Value, Recurring | Foreign government securities
Assets:
Available-for-Sale Investments	8,181,000
Fair Value, Recurring | US Government Securities
Assets:
Available-for-Sale Investments	86,787,000
Level 1 | Fair Value, Recurring
Assets:
Available-for-Sale Investments	86,787,000
Liabilities:
Total liabilities	0	124,545,000
Level 1 | Fair Value, Recurring | Asset backed securities
Assets:
Available-for-Sale Investments	0
Level 1 | Fair Value, Recurring | Certificates of deposits
Assets:
Available-for-Sale Investments	0
Level 1 | Fair Value, Recurring | Corporate notes and bonds
Assets:
Available-for-Sale Investments	0
Level 1 | Fair Value, Recurring | Commercial paper
Assets:
Available-for-Sale Investments	0
Level 1 | Fair Value, Recurring | Foreign government securities
Assets:
Available-for-Sale Investments	0
Level 1 | Fair Value, Recurring | US Government Securities
Assets:
Available-for-Sale Investments	86,787,000
Level 2 | Fair Value, Recurring
Assets:
Available-for-Sale Investments	442,114,000
Liabilities:
Total liabilities	0	0
Level 2 | Fair Value, Recurring | Asset backed securities
Assets:
Available-for-Sale Investments	111,552,000
Level 2 | Fair Value, Recurring | Certificates of deposits
Assets:
Available-for-Sale Investments	6,002,000
Level 2 | Fair Value, Recurring | Corporate notes and bonds
Assets:
Available-for-Sale Investments	206,989,000
Level 2 | Fair Value, Recurring | Commercial paper
Assets:
Available-for-Sale Investments	109,391,000
Level 2 | Fair Value, Recurring | Foreign government securities
Assets:
Available-for-Sale Investments	8,181,000
Level 2 | Fair Value, Recurring | US Government Securities
Assets:
Available-for-Sale Investments	0
Level 3 | Fair Value, Recurring
Assets:
Available-for-Sale Investments	0
Liabilities:
Total liabilities	6,293,000	53,687,000
Level 3 | Fair Value, Recurring | Asset backed securities
Assets:
Available-for-Sale Investments	0
Level 3 | Fair Value, Recurring | Certificates of deposits
Assets:
Available-for-Sale Investments	0
Level 3 | Fair Value, Recurring | Corporate notes and bonds
Assets:
Available-for-Sale Investments	0
Level 3 | Fair Value, Recurring | Commercial paper
Assets:
Available-for-Sale Investments	0
Level 3 | Fair Value, Recurring | Foreign government securities
Assets:
Available-for-Sale Investments	0
Level 3 | Fair Value, Recurring | US Government Securities
Assets:
Available-for-Sale Investments	0
Public Common Stock Warrants | Fair Value, Recurring
Liabilities:
Common Stock Warrants	0	124,545,000
Public Common Stock Warrants | Level 1 | Fair Value, Recurring
Liabilities:
Common Stock Warrants	0	124,545,000
Public Common Stock Warrants | Level 2 | Fair Value, Recurring
Liabilities:
Common Stock Warrants	0	0
Public Common Stock Warrants | Level 3 | Fair Value, Recurring
Liabilities:
Common Stock Warrants	0	0
Private Common Stock Warrants | Fair Value, Recurring
Liabilities:
Common Stock Warrants	6,293,000	53,687,000
Private Common Stock Warrants | Level 1 | Fair Value, Recurring
Liabilities:
Common Stock Warrants	0	0
Private Common Stock Warrants | Level 2 | Fair Value, Recurring
Liabilities:
Common Stock Warrants	0	0
Private Common Stock Warrants | Level 3 | Fair Value, Recurring
Liabilities:
Common Stock Warrants	$ 6,293,000	$ 53,687,000

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