Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 229,204 $ 143,180
Accounts receivable 1,108 1,019
Prepaid expenses and other current assets 1,874 786
Total current assets 232,186 144,985
Property and equipment, net 15,003 2,130
Restricted cash and other non-current assets 1,619 2,248
Total assets 248,808 149,363
Current liabilities:    
Accounts payable 2,909 1,381
Accrued expenses 7,251 5,456
Deferred rent, current portion 62 88
Total current liabilities 10,222 6,925
Deferred rent, net of current portion 71  
Deferred revenue 25,479 25,321
Warrant to purchase redeemable securities   289
Construction financing lease obligation 11,649  
Other non-current liabilities 24 27
Total liabilities $ 47,445 $ 32,562
Commitments and contingencies (see note 6)
Stockholders’ equity (deficit)    
Preferred stock
Common stock, $0.0001 par value per share: 195,000,000 shares and 92,000,000 shares authorized at March 31, 2016 and December 31, 2015, respectively; 36,608,136 and 4,869,829 shares issued, and 35,169,842 and 3,233,638 shares outstanding at March 31, 2016 and December 31, 2015, respectively $ 4  
Additional paid-in capital 307,448 $ 5,234
Accumulated deficit (106,089) (88,348)
Total stockholders’ equity (deficit) 201,363 (83,114)
Total liabilities, redeemable convertible preferred stock and stockholders’ equity (deficit) $ 248,808 149,363
Series A-1 redeemable convertible    
Stockholders’ equity (deficit)    
Preferred stock   21,137
Series A-2 redeemable convertible    
Stockholders’ equity (deficit)    
Preferred stock   59,027
Series B redeemable convertible    
Stockholders’ equity (deficit)    
Preferred stock   $ 119,751