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Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
Performance_Obligation
Segment
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2014
USD ($)
$ / shares
shares
Significant Accounting Policies [Line Items]        
Restricted cash $ 2,138,000 $ 2,138,000    
Unbilled receivables 900,000 2,400,000    
Impairment of goodwill 0      
Impairment losses on intangible assets $ 0      
Warrants issued to purchase stock | shares 56,875      
Fair value adjustment of warrants   2,266,000 $ (6,000)  
Advertising expenses $ 14,500,000 6,600,000 $ 3,500,000  
Number of operating segment | Segment 1      
Operating lease right-of-use assets $ 99,350,000      
Operating lease liabilities 107,862,000      
Accumulated deficit $ (511,612,000) (365,478,000)    
ASU 2016-02 (Topic 842)        
Significant Accounting Policies [Line Items]        
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2020      
Change in accounting principle, accounting standards update, early adoption false      
Change in accounting principle, accounting standards update, adopted true      
Change in accounting principle, accounting standards update, immaterial effect false      
Operating lease right-of-use assets $ 33,000,000.0      
Operating lease liabilities 39,700,000      
Derecognized portion of build-to-suit asset 36,600,000      
Derecognition of build-to-suit liabilities 36,600,000      
Accumulated deficit 100,000      
Derecognition of deferred rent 7,300,000      
Reclassification of tenant incentive receivables $ 500,000      
Accounting Standards Update 2016-13        
Significant Accounting Policies [Line Items]        
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2020      
Change in accounting principle, accounting standards update, early adoption false      
Change in accounting principle, accounting standards update, adopted true      
Change in accounting principle, accounting standards update, immaterial effect true      
Accounting Standards Update 2018-15        
Significant Accounting Policies [Line Items]        
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2020      
Change in accounting principle, accounting standards update, early adoption false      
Change in accounting principle, accounting standards update, adopted true      
Change in accounting principle, accounting standards update, immaterial effect true      
Accounting Standards Update 2019-12        
Significant Accounting Policies [Line Items]        
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2020      
Change in accounting principle, accounting standards update, early adoption true      
Change in accounting principle, accounting standards update, adopted true      
Change in accounting principle, accounting standards update, immaterial effect true      
Sequencing Revenue        
Significant Accounting Policies [Line Items]        
Number of revenue performance obligations | Performance_Obligation 2      
Series C Convertible Preferred Stock        
Significant Accounting Policies [Line Items]        
Warrants issued to purchase stock | shares       56,875
Weighted-average exercise price of warrants | $ / shares       $ 2.64
Line of credit facility       $ 5,000,000.0
Fair value adjustment of warrants   2,300,000    
Financial liabilities $ 2,600,000      
Property and Equipment, Net        
Significant Accounting Policies [Line Items]        
Building costs   $ 36,600,000