Quarterly report pursuant to Section 13 or 15(d)

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details)

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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES        
Professional services     $ 3,519 $ 2,508
Compensation and benefits related     3,516 2,068
Warranty reserve $ 1,813 $ 1,491 1,813 1,553
Inventory purchases     1,716 86
Income tax payable     1,405  
Customer payable     605  
Sales and use and franchise taxes     506 586
Franchise and royalty fees     188 159
Other     2,056 605
Total accrued expenses and other current liabilities     $ 15,324 $ 7,565
Warranty reserve, at the beginning of the period 1,553 1,491    
Warranty reserve assumed in acquisition 326      
Additions to warranty reserve 86 346    
Claims fulfilled (152) (284)    
Warranty reserve, at the end of the period $ 1,813 $ 1,553