Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities

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Accrued Liabilities
 3 Months Ended
Mar. 31, 2021
Accrued Liabilities and Other Liabilities [Abstract]  
Accrued Liabilities Accrued Liabilities
 
Accrued liabilities consisted of the following:
March 31, 2021 December 31, 2020
Salaries, benefits and related expenses $ 1,267  $ 1,194 
Device warranty 153  188 
Other 55  47 
Total $ 1,475  $ 1,429 
 
The current portion of the warranty liability is classified as a component of accrued liabilities, while the long-term portion of the warranty liability is classified as a component of other non-current liabilities in the condensed consolidated balance sheets. A reconciliation of the changes in the device warranty liability for the three months ended March 31, 2021 is as follows:
  March 31, 2021
Balance at beginning of period $ 226 
Additions for estimated future expense 46 
Incurred costs (77)
Balance at end of period $ 195 
Current portion $ 153 
Long-term portion 42 
Total $ 195