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Balance Sheets Details
 3 Months Ended
Mar. 31, 2020
Balance Sheets Details [Abstract]  
Balance Sheets Details Balance Sheets Details
Inventories
Inventories consisted of the following (in thousands):
March 31, 2020December 31, 2019
Raw materials$104  $7  
Work-in-process8  26  
Finished goods589  338  
    Inventories$701  $371  
Property and Equipment, net
Property and equipment, net consisted of the following (in thousands):
March 31, 2020December 31, 2019
Laboratory equipment$24,323  $23,561  
Leasehold improvements10,804  10,804  
Computer equipment and software3,098  3,016  
Office equipment and furniture1,329  1,461  
Construction in progress467  691  
Property and equipment40,021  39,533  
       Less: accumulated depreciation and amortization(33,374) (33,251) 
     Property and equipment, net$6,647  $6,282  

Goodwill
Goodwill had a carrying value of approximately $3.2 million as of March 31, 2020 and December 31, 2019.
Other Accrued Liabilities
Other accrued liabilities consisted of the following (in thousands):
March 31, 2020December 31, 2019
Accrued purchases $5,654  $4,386  
Accrued professional and outside service fees3,111  1,802  
Other158  352  
     Total$8,923  $6,540