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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 226,099 $ 103,193
Accounts receivable 250 523
Prepaid expenses 8,265 8,913
Other current assets 2,474 3,046
Total current assets 237,088 115,675
Property, equipment, and software—net 32,962 21,147
Intangible assets—net 1,453 1,466
Other assets 417 312
Total assets 271,920 138,600
Current liabilities:    
Accounts payable 2,882 2,218
Accrued expenses and other current liabilities 5,809 3,421
Deferred revenue 7,129 8,436
Total current liabilities 15,820 14,075
Deferred revenue—noncurrent 79,245 82,807
Deferred rent—noncurrent 2,877 1,758
Total liabilities 97,942 98,640
Commitments and contingencies (Note 5)
Stockholders’ equity:    
Preferred stock
Additional paid-in capital 310,339 126,094
Accumulated deficit (135,409) (85,187)
Treasury stock (952) (952)
Total stockholders’ equity 173,978 39,960
Total liabilities and stockholders’ equity $ 271,920 138,600
Series A Convertible Preferred Stock    
Stockholders’ equity:    
Preferred stock   3
Total stockholders’ equity   3
Series B Convertible Preferred Stock    
Stockholders’ equity:    
Preferred stock   2
Total stockholders’ equity   $ 2