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Summary of Significant Accounting Policies - Revision of Prior Period (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Stockholders' Equity                
Total stockholders’ equity (deficit) $ 1,015,579 $ 534,868 $ 1,015,579 $ 534,868 $ 1,029,090 $ 1,061,865 $ 541,913 $ 257,652
Cash flows from operating activities:                
Amortization of deferred rent       0        
Amortization of right-of-use asset and other     19,818 15,824        
Other adjustments     1,496 176        
Operating lease liabilities     (19,735) (12,852)        
Net cash used in operating activities     (30,574) 11,233        
Cash flows from investing activities:                
Purchase of property and equipment     (31,267) (23,602)        
Net cash provided by investing activities     (683,847) (6,747)        
Cash flows from financing activities:                
Repayments of capital lease liabilities       0        
Repayments of finance lease liabilities (3,985) (1,001) (10,564) (3,901)        
Net cash provided by financing activities     933,948 289,479        
Supplemental disclosure of cash flow information:                
Capital lease outstanding on current year addition       0        
Assets obtained in exchange for operating lease obligations 12,264 4,817 25,745 15,095        
Assets obtained in exchange for finance lease obligations 12,861 3,510 28,399 11,352        
Cumulative Effect, Period of Adoption, Adjustment                
Stockholders' Equity                
Total stockholders’ equity (deficit)               (252)
As previously reported                
Stockholders' Equity                
Total stockholders’ equity (deficit)   535,120   535,120     542,165 257,652
Cash flows from operating activities:                
Amortization of deferred rent       2,941        
Amortization of right-of-use asset and other       0        
Other adjustments       207        
Operating lease liabilities       0        
Net cash used in operating activities       11,233        
Cash flows from investing activities:                
Purchase of property and equipment       (24,443)        
Net cash provided by investing activities       (7,588)        
Cash flows from financing activities:                
Repayments of capital lease liabilities       (3,060)        
Repayments of finance lease liabilities       0        
Net cash provided by financing activities       290,320        
Supplemental disclosure of cash flow information:                
Capital lease outstanding on current year addition       5,439        
Assets obtained in exchange for operating lease obligations       0        
Assets obtained in exchange for finance lease obligations       0        
As previously reported | Cumulative Effect, Period of Adoption, Adjustment                
Stockholders' Equity                
Total stockholders’ equity (deficit)               0
Adjustments                
Stockholders' Equity                
Total stockholders’ equity (deficit)   (252)   (252)     (252) 0
Cash flows from operating activities:                
Amortization of deferred rent       (2,941)        
Amortization of right-of-use asset and other       15,824        
Other adjustments       (31)        
Operating lease liabilities       (12,852)        
Net cash used in operating activities       0        
Cash flows from investing activities:                
Purchase of property and equipment       841        
Net cash provided by investing activities       841        
Cash flows from financing activities:                
Repayments of capital lease liabilities       3,060        
Repayments of finance lease liabilities       (3,901)        
Net cash provided by financing activities       (841)        
Supplemental disclosure of cash flow information:                
Capital lease outstanding on current year addition       (5,439)        
Assets obtained in exchange for operating lease obligations       15,095        
Assets obtained in exchange for finance lease obligations       11,352        
Adjustments | Cumulative Effect, Period of Adoption, Adjustment                
Stockholders' Equity                
Total stockholders’ equity (deficit)               (252)
Accumulated Deficit                
Stockholders' Equity                
Total stockholders’ equity (deficit) $ (453,369) (242,489) $ (453,369) (242,489) $ (397,171) $ (288,193) (218,711) (192,009)
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment                
Stockholders' Equity                
Total stockholders’ equity (deficit)               (252)
Accumulated Deficit | As previously reported                
Stockholders' Equity                
Total stockholders’ equity (deficit)   (242,237)   (242,237)     (218,459) (192,009)
Accumulated Deficit | As previously reported | Cumulative Effect, Period of Adoption, Adjustment                
Stockholders' Equity                
Total stockholders’ equity (deficit)               0
Accumulated Deficit | Adjustments                
Stockholders' Equity                
Total stockholders’ equity (deficit)   $ (252)   $ (252)     $ (252) 0
Accumulated Deficit | Adjustments | Cumulative Effect, Period of Adoption, Adjustment                
Stockholders' Equity                
Total stockholders’ equity (deficit)               $ (252)