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Condensed Consolidated Balance Sheet Components
 6 Months Ended
Jun. 30, 2020
Balance Sheet Related Disclosures [Abstract]  
Condensed Consolidated Balance Sheet Components Condensed Consolidated Balance Sheet Components
Property and Equipment, Net
Property and equipment, net consist of the following:
June 30, 2020December 31, 2019
(unaudited)
(in thousands)
Machinery and equipment
$35,584  $29,119  
Computer hardware
9,105  6,296  
Leasehold improvements
29,349  21,031  
Furniture and fixtures
2,725  1,962  
Computer software
1,027  829  
Construction in progress
7,151  6,354  
Property and equipment, gross
$84,941  $65,591  
Less: accumulated depreciation
(27,946) (21,923) 
Property and equipment, net
$56,995  $43,668  
Depreciation expense related to property and equipment was $3.2 million and $2.2 million for the three months ended June 30, 2020 and 2019, respectively, and $6.2 million and $4.3 million for the six months ended June 30, 2020 and 2019, respectively.
Accrued Expenses
Accrued expenses consist of the following:
June 30, 2020December 31, 2019
(unaudited)
(in thousands)
Accrued royalty obligations
$325  $1,564  
Accrued legal expenses
2,598  1,046  
Accrued tax liabilities
3,268  3,050  
Accrued professional services
3,275  3,464  
Accrued clinical trials and studies1,734  2,029  
Purchases of property and equipment included in accrued expenses
1,476  2,424  
Operating lease liabilities
8,240  7,140  
Others
3,139  4,986  
Total accrued expenses
$24,055  $25,703