Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 53,314	$ 34,393
Short-term investments	13,372	27,131
Accounts receivable	9,517	7,571
Inventory, net	12,664	10,355
Prepaid expenses and other current assets	10,563	9,696
Total current assets	99,430	89,146
Property and equipment, net	40,427	33,286
Restricted cash	11,700	11,234
Other assets	6,573	1,751
Total assets	158,130	135,417
Current liabilities
Accounts payable	4,469	5,149
Accrued consignor payable	33,404	35,259
Other accrued and current liabilities	42,475	41,956
Long-term debt, current portion	6,498	5,990
Total current liabilities	86,846	88,354
Long-term debt, net of current portion		3,249
Other noncurrent liabilities	10,076	7,304
Total liabilities	96,922	98,907
Commitments and contingencies (Note 10)
Temporary equity	367,330	294,200
Stockholders’ deficit:
Common stock, $0.00001 par value; 155,649,887 and 145,467,774 shares authorized as of June 30, 2019 and December 31, 2018, respectively; 9,701,266 and 8,593,077 shares issued and outstanding as of June 30, 2019 and December 31, 2018, respectively	1
Additional paid-in capital	1,729
Accumulated comprehensive income (loss)	5	(25)
Accumulated deficit	(307,857)	(257,665)
Total stockholders’ deficit	(306,122)	(257,690)
Total liabilities, redeemable convertible preferred stock, convertible preferred stock and stockholders’ deficit	158,130	135,417
Redeemable Convertible Preferred Stock
Current liabilities
Temporary equity	198,228	151,381
Convertible Preferred Stock
Current liabilities
Temporary equity	$ 169,102	$ 142,819