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Other Balance Sheet Components
 12 Months Ended
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Other Balance Sheet Components Balance Sheet Components
Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets, as of December 31, 2020 and 2019 consists of the following (in thousands):
December 31,
20202019
Down payments to manufacturing vendors$216,538 $— 
Prepaid expenses
15,647 8,475 
Tenant incentives receivables
10,242 4,093 
Interest receivable on marketable securities
9,725 6,835 
Prepaid expenses and other current assets
$252,152 $19,403 
Accrued Liabilities

Accrued liabilities, as of December 31, 2020 and 2019 consists of the following (in thousands):

December 31,
20202019
Clinical trials$97,249 $6,291 
Compensation-related
95,247 27,428 
Raw materials 78,085 — 
Manufacturing53,412 5,872 
Development operations29,253 2,567 
Property and equipment
17,576 4,029 
Commercial6,922 — 
Other external goods and services91,847 21,465 
Accrued liabilities$469,591 $67,652 

Other Current Liabilities

Other current liabilities, as of December 31, 2020 and 2019 consists of the following (in thousands):

December 31,
20202019
Lease liabilities - financing$24,328 $— 
Lease liabilities - operating5,972 3,583 
Other3,365 1,480 
Other current liabilities$33,665 $5,063 

The following table summarizes the activities in deferred revenue during the year ended December 31, 2020 (in thousands):

December 31, 2019AdditionsDeductionsDecember 31, 2020
Product sales$— $3,881,303 $(82,134)$3,799,169 
Grant revenue2,777 6,775 (4,291)5,261 
Collaboration revenue199,528 121,882 (81,228)240,182 
Total deferred liabilities$202,305 $4,009,960 $(167,653)$4,044,612