CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 307,064 $ 104,288
Investments 96,987  
Prepaid expenses and other current assets 9,737 700
Restricted cash 622  
Total current assets 414,410 104,988
Property, plant and equipment, net 62,796 2,415
Restricted cash 1,735 284
Other assets 168  
Total assets 479,109 107,687
Current liabilities:    
Accounts payable 7,886 2,033
Accrued expenses and other current liabilities 12,118 2,986
Current portion of long-term debt   2,139
Total current liabilities 20,004 7,158
Long-term debt, net of discount and current portion 24,347 3,302
Deferred rent 143 158
Preferred stock warrant liability   866
Liability for early exercise of stock options and restricted stock 166 100
Lease liability, net of current portion 41,441  
Total liabilities 86,101 11,584
Commitments and contingencies (Note 12)
Convertible preferred stock (Series A, B and C), $0.001 par value; no shares and 44,070,808 shares authorized at December 31, 2018 and 2017, respectively; no shares and 43,933,006 shares issued and outstanding at December 31, 2018 and 2017, respectively   139,790
Stockholders' equity (deficit):    
Preferred stock, $0.001 par value; 10,000,000 shares and no shares authorized at December 31, 2018 and 2017, respectively; no shares issued or outstanding at December 31, 2018 and 2017
Common stock, $0.001 par value; 150,000,000 and 65,000,000 shares authorized at December 31, 2018 and 2017, respectively; 79,234,853 and 14,977,317 shares issued and outstanding at December 31, 2018 and 2017, respectively 79 15
Additional paid-in capital 543,040 17,277
Accumulated other comprehensive loss (29)  
Accumulated deficit (150,082) (60,979)
Total stockholders' equity (deficit) 393,008 (43,687)
Total liabilities, convertible preferred stock and stockholders' equity (deficit) $ 479,109 $ 107,687