CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 16,142,000	$ 36,963,000
Marketable securities	114,967,000	46,679,000
Accounts receivable, net of allowance for doubtful accounts of $1,816 and $1,679 as of December 31, 2019 and December 31, 2018, respectively	37,136,000	24,729,000
Restricted cash	70,087,000	0
Prepaid expenses and other current assets	10,991,000	8,896,000
Total current assets	249,323,000	117,267,000
Property and equipment, net	60,037,000	42,354,000
Goodwill	372,000	360,000
Intangible assets, net	1,125,000	610,000
Other assets	10,112,000	2,163,000
Total assets	320,969,000	162,754,000
Current liabilities:
Accounts payable	4,602,000	2,333,000
Accrued expenses	19,878,000	15,535,000
Current portion of long-term debt	4,472,000	11,370,000
Other current liabilities	8,169,000	2,512,000
Total current liabilities	37,121,000	31,750,000
Long-term debt, less current portion	25,158,000	39,439,000
Convertible preferred stock warrant liabilities	0	3,261,000
Other long-term liabilities	1,038,000	647,000
Total liabilities	63,317,000	75,097,000
Commitments and contingencies (Note 9)
Convertible preferred stock series Seed, A, B, C, D, E and F in aggregate, $0.00002 par value; 0 and 54,148,643 shares authorized as of December 31, 2019 and 2018, respectively; 0 and 53,630,213 issued and outstanding at December 31, 2019 and 2018, respectively	0	219,584,000
Stockholders’ equity (deficit):
Class A and Class B common stock, $0.00002 par value; 1,094,129,050 and 97,500,000 shares authorized as of December 31, 2019 and 2018, respectively; 94,817,715 and 25,025,836 shares issued and outstanding at December 31, 2019 and 2018, respectively	2,000	1,000
Additional paid-in capital	449,463,000	16,403,000
Treasury stock	0	(2,109,000)
Accumulated other comprehensive income (loss)	196,000	(36,000)
Accumulated deficit	(192,009,000)	(146,186,000)
Total stockholders’ equity (deficit)	257,652,000	(131,927,000)
Total liabilities, convertible preferred stock, and stockholders’ equity (deficit)	$ 320,969,000	$ 162,754,000