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Accounts receivable, net (Tables)
12 Months Ended
Dec. 31, 2021
Accounts Receivable, after Allowance for Credit Loss [Abstract]  
Schedule of Accounts Receivable, Net

Accounts receivable consisted of the following:

(in thousands)

 

December 31,
2021

 

 

December 31,
2020

 

Trade receivables

 

$

38,597

 

 

$

23,691

 

Revenue recognized in excess of billings

 

 

72,676

 

 

 

1,224

 

Other receivables

 

 

147

 

 

 

47

 

Total

 

 

111,420

 

 

 

24,962

 

Allowance for doubtful accounts

 

 

(3,872

)

 

 

(1,228

)

Accounts receivable, net

 

$

107,548

 

 

$

23,734

 

Summary of changes in the Allowance for Doubtful Trade Receivables

Activity in the allowance for doubtful accounts for each period was as follows:

 

 

Year ended December 31,

 

(in thousands)

 

2021

 

 

2020

 

 

2019

 

Balance at beginning of period

 

$

1,228

 

 

$

441

 

 

$

 

Additions charged to earnings

 

 

4,045

 

 

 

787

 

 

 

441

 

Write-offs of uncollectible accounts

 

 

(1,401

)

 

 

 

 

 

 

Balance at end of period

 

$

3,872

 

 

$

1,228

 

 

$

441