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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 162,654 $ 75,975
Prepaid expenses and other current assets 454 1,156
Total current assets 163,108 77,131
Restricted cash 60 20
Total assets 163,168 77,151
Current liabilities:    
Accounts payable 3,248 1,373
Accrued expenses and other current liabilities 1,492 969
Total current liabilities 4,740 2,342
Other liabilities 39  
Total liabilities 4,779 2,342
Commitments and contingencies (Note 10)
Stockholders' equity (deficit):    
Redeemable convertible preferred stock (Series A and B), $0.0001 par value; no shares authorized, issued and outstanding as of June 30, 2019; 64,730,410 shares authorized, issued and outstanding as of December 31, 2018; aggregate liquidation preference of $0 and $96,358 as of June 30, 2019 and December 31, 2018, respectively   124,728
Common stock, $0.0001 par value, 150,000,000 shares authorized as of June 30, 2019 and 75,000,000 shares authorized as of December 31, 2018; 28,555,379 and 238,986 shares issued and outstanding as of June 30, 2019 and December 31, 2019, respectively 3  
Additional paid-in capital 257,541 36,646
Accumulated deficit (99,155) (86,565)
Total stockholders' equity (deficit) 158,389 (49,919)
Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit) $ 163,168 $ 77,151