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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 101,740 $ 49,886
Marketable securities 19,978 49,793
Prepaid expenses and other current assets 2,012 1,417
Restricted cash, current portion 638 638
Total current assets 124,368 101,734
Property and equipment, net 5,443 3,861
Other long-term assets 889 881
Restricted cash, net of current portion 3,376 290
Right-of-use assets– operating lease 16,831  
Right-of-use asset – financing lease 920  
Total assets 151,827 106,766
Current liabilities:    
Accounts payable 1,759 3,309
Accrued expenses 10,057 13,893
Deferred revenue, current portion 1,661 1,926
Deferred rent, current portion   392
Financing and capital lease obligations, current portion 226 9
Operating lease obligations, current portion 1,629  
Total current liabilities 15,332 19,529
Deferred rent, net of current portion 9,295 353
Deferred revenue, net of current portion 7,625 8,276
Financing and capital lease obligations, net of current portion 708 22
Operating lease obligation, net of current portion 16,247  
Commitments and contingencies (See Note 8)
Stockholders' equity:    
Preferred stock, $0.001 par value; 10,000,000 shares authorized at June 30, 2019 and December 31, 2018; 666 and 0 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively (equivalent to 666,000 shares of common stock upon conversion)
Common stock, $0.001 par value; 200,000,000 shares authorized at June 30, 2019 and December 31, 2018; 42,435,497 and 33,765,864 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively 43 34
Additional paid-in capital 365,329 296,100
Accumulated other comprehensive gain (loss) 4 (3)
Accumulated deficit (253,461) (217,545)
Total stockholders' equity 111,915 78,586
Total liabilities and stockholders' equity $ 151,827 $ 106,766

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