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Balance Sheet Details (Tables)
 6 Months Ended
Jun. 27, 2020
Balance Sheet Related Disclosures [Abstract]  
Summary of accounts receivable, net
Accounts receivable, net consisted of the following (in thousands):
June 27,
2020		December 31,
2019
Accounts receivable$60,020  $46,883  
Allowance for doubtful accounts(1,430) (374) 
$58,590  $46,509  
Summary of inventory
Inventory consisted of the following (in thousands):
June 27,
2020		December 31,
2019
Raw materials$383  $656  
Finished goods36,276  39,497  
$36,659  $40,153  
Summary of property and equipment, net
Property and equipment, net consisted of the following (in thousands):
June 27,
2020		December 31,
2019
Test equipment$38,993  $37,001  
Software17,548  20,646  
Computer equipment11,229  10,835  
Furniture and fixtures2,197  2,342  
Leasehold improvements1,428  2,047  
Total71,395  72,871  
Accumulated depreciation and amortization(50,429) (51,344) 
$20,966  $21,527  
Schedule of other long-term assets
Other long-term assets consisted of the following (in thousands):
June 27,
2020		December 31,
2019
Intangible asset$10,833  $12,148  
Capitalized cloud implementation costs2,895  6,089  
Other long-term assets1,297  1,203  
$15,025  $19,440  
Summary of accrued liabilities
Accrued liabilities consisted of the following (in thousands):
June 27,
2020		December 31,
2019
Compensation and related benefits$19,501  $19,010  
Warranty and retrofit7,732  7,294  
Customer advances or rebates6,948  7,252  
Component inventory held by suppliers5,723  1,925  
Current portion of financing arrangements5,296  4,044  
Professional and consulting fees4,921  4,996  
Operating leases2,718  2,663  
Taxes payable2,175  2,021  
Restructuring charges1,383  —  
Operations1,248  1,053  
Product returns1,229  919  
Freight1,054  808  
Other4,756  5,561  
$64,684  $57,546  
Product warranty activities Changes in the Company’s warranty and retrofit accrual are as follows (in thousands):
 Three Months EndedSix Months Ended
June 27,
2020		June 29,
2019		June 27,
2020		June 29,
2019
Balance at beginning of period$7,430  $8,166  $7,294  $8,547  
Provision for warranty and retrofit charged to cost of revenue1,276  860  2,625  1,567  
Utilization of reserve(974) (1,116) (2,187) (2,204) 
Balance at end of period$7,732  $7,910  $7,732  $7,910  
Restructuring and Related Costs
The following table summarizes the activities pursuant to the above restructuring plan (in thousands):
FacilitiesSeverance and Related BenefitsTotal
Balance at March 28, 2020$—  $—  $—  
Restructuring charges5,112  1,174  6,286  
Asset write-down(3,747) —  (3,747) 
Cash payments—  (65) (65) 
Balance at June 27, 2020$1,365  $1,109  $2,474