Balance Sheets - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 96,576,000	$ 55,030,000
Short-term marketable securities	480,290,000	109,988,000
Accounts receivable, net	12,676,000	4,807,000
Inventory	9,069,000	7,838,000
Prepaid expenses and other current assets	14,079,000	3,055,000
Total current assets	612,690,000	180,718,000
Long-term assets
Property and equipment, net	60,355,000	19,125,000
Long-term marketable securities	105,435,000
Restricted cash	2,138,000	61,000
Intangible assets, net	11,928,000	13,626,000
Goodwill	118,972,000	118,972,000
Other assets	784,000	186,000
Total assets	912,302,000	332,688,000
Current liabilities
Accounts payable	4,453,000	1,793,000
Accrued liabilities	4,371,000	2,562,000
Accrued compensation and benefits	8,124,000	4,641,000
Current portion of deferred rent	371,000	1,109,000
Current deferred revenue	60,994,000	12,695,000
Total current liabilities	78,313,000	22,800,000
Long-term liabilities
Convertible preferred stock warrant liability		336,000
Deferred rent liability, less current portion	6,918,000	6,102,000
Financing obligation	36,607,000
Deferred revenue, less current portion	219,332,000	704,000
Other long-term liabilities	93,000
Total liabilities	341,263,000	29,942,000
Commitments and contingencies (Note 10)
Convertible preferred stock: $0.0001 par value, no and 93,762,517 shares authorized at December 31, 2019 and 2018, respectively; no and 92,790,094 shares issued and outstanding at December 31, 2019 and 2018, respectively; aggregate liquidation preference of $0 and $572,866 at December 31, 2019 and 2018, respectively		560,858,000
Shareholders’ equity (deficit)
Preferred stock: $0.0001 par value, 10,000,000 and no shares authorized at December 31, 2019 and 2018, respectively; no shares issued and outstanding at December 31, 2019 and 2018
Common stock: $0.0001 par value, 340,000,000 and 131,000,000 shares authorized at December 31, 2019 and 2018, respectively; 125,238,142 and 12,841,536 shares issued and outstanding at December 31, 2019 and 2018, respectively	12,000	1,000
Additional paid-in capital	935,834,000	37,902,000
Accumulated other comprehensive gain (loss)	671,000	(107,000)
Accumulated deficit	(365,478,000)	(295,908,000)
Total shareholders’ equity (deficit)	571,039,000	(258,112,000)
Total liabilities, convertible preferred stock and shareholders’ equity (deficit)	$ 912,302,000	$ 332,688,000