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Fair Value of Financial Instruments
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments Fair Value of Financial Instruments
Cash and cash equivalents, accounts receivable, contract assets, prepaid expenses and other current assets, accounts payable, accrued expenses, contract liabilities, other current liabilities, and long-term debt are reflected on the consolidated balance sheets at amounts that approximate fair value because of the short-term nature of these financial assets and liabilities.

Private warrants and written put options are valued using a modified Black-Scholes option pricing model, which is considered to be a Level 3 fair value measurement. See the Note - Warrants for information on the Level 3 inputs used to value the private warrants and the Note – Written Put Options for information on the Level 3 inputs used to value the written put options.

The table below presents the financial liabilities measured at fair value on a recurring basis:
Successor
December 31, 2021
Balance Sheet Caption
Level 1
Level 2Level 3Total
Private warrantsOther non-current liabilities$— $— $319 $319 
Written put optionsDerivative liabilities— — 44,827 44,827 

The changes in the fair value of the Level 3 liabilities are as follows:
Level 3
Private warrantsWritten put options
December 31, 2020$— $— 
Additions
422 11,371 
Changes in fair value
(103)33,456 
December 31, 2021$319 $44,827