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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 113,798 $ 115,069
Marketable securities 71,333 60,576
Prepaid expenses and other current assets 3,247 2,296
Total current assets 188,378 177,941
Property and equipment, net 3,471 3,190
Operating lease right-of-use asset 4,857  
Restricted cash 205 205
Total assets 196,911 181,336
Current liabilities:    
Accounts payable 1,863 3,303
Accrued expenses 5,584 7,157
Deferred rent   16
Operating lease liability 1,063  
Loan payable   424
Deferred revenue 23,524 20,209
Other current liabilities 15 14
Total current liabilities 32,049 31,123
Long-term portion of deferred rent   871
Long-term portion of operating lease liability 4,655  
Other long-term liabilities 17 24
Long-term portion of deferred revenue 31,235 42,695
Total liabilities 67,956 74,713
Commitments and contingencies (Note 8)
Stockholders' equity:    
Preferred stock, $0.001 par value; 10,000,000 shares authorized at June 30, 2019 and December 31, 2018; no shares issued and outstanding at June 30, 2019 and December 31, 2018
Common stock, $0.001 par value; 150,000,000 shares authorized and 29,230,330 shares issued and outstanding as of June 30, 2019; 150,000,000 shares authorized and 26,217,701 shares issued and outstanding as of December 31, 2018 29 26
Additional paid-in capital 258,996 213,453
Accumulated other comprehensive income (loss) 58 (8)
Accumulated deficit (130,128) (106,848)
Total stockholders' equity 128,955 106,623
Total liabilities and stockholders' equity $ 196,911 $ 181,336