Prepaid Expenses and Other Current Assets, Accrued Expenses, Other Current Liabilities, and Other Liabilities (Tables)

12 Months Ended

Dec. 31, 2019

Payables and Accruals [Abstract]

Components of Prepaid Expenses and Other Current Assets

The following table presents the components of selected balance sheet items as of December 31, 2019 and 2018:

	December 31,
	2019		2018
	(in thousands)
Prepaid expenses and other current assets:
Deferred costs in transit	$	104,947	$	83,652
Prepaid assets	46,177		31,003
Supplier receivable	28,245		31,842
Supplier credits receivable	20,083		17,667
Other current assets	29,269		31,266
Total prepaid expenses and other current assets	$	228,721	$	195,430

Components of Accrued Expenses

	December 31,
	2019		2018
	(in thousands)
Accrued expenses:
Employee compensation and related benefits	$	141,922	$	91,914
Advertising	71,597		67,259
Credit card	13,943		16,740
Accrued property, plant and equipment	18,348		13,955
Audit, legal and professional fees	4,018		1,703
Other accrued expenses	49,090		21,426
Total accrued expenses	$	298,918	$	212,997

Components of Other Liabilities

	December 31,
	2019		2018
	(in thousands)
Other current liabilities:
Short term lease liability (1)	$	91,104	$	—
Sales tax payable	62,173		49,989
Sales return reserve	38,042		35,707
Other current liabilities	45,544		42,299
Total current other liabilities	$	236,863	$	127,995

	December 31,
	2019		2018
	(in thousands)
Other liabilities:
Construction costs under build-to-suit leases (1)	$	—	$	60,089
Deferred rent (1)	—		99,746
Other liabilities	6,940		553
Total other liabilities	$	6,940	$	160,388

(1) On January 1, 2019 the Company adopted ASU 2016-02. Refer to Note 2, Summary of Significant Accounting Policies for adjustments recorded.