Condensed Balance Sheets - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 48,458,000	$ 55,030,000
Short-term marketable securities	374,543,000	109,988,000
Accounts receivable, net	7,252,000	4,807,000
Inventory	8,004,000	7,838,000
Prepaid expenses and other current assets	4,044,000	3,055,000
Total current assets	442,301,000	180,718,000
Long-term assets
Property and equipment, net	22,298,000	19,125,000
Restricted cash and other assets	5,040,000	247,000
Intangible assets, net	12,784,000	13,626,000
Goodwill	118,972,000	118,972,000
Total assets	601,395,000	332,688,000
Current liabilities
Accounts payable	2,944,000	1,793,000
Accrued liabilities	5,019,000	2,562,000
Accrued compensation and benefits	4,429,000	4,641,000
Current portion of deferred rent	1,276,000	1,109,000
Current deferred revenue	61,194,000	12,695,000
Total current liabilities	74,862,000	22,800,000
Long-term liabilities
Convertible preferred stock warrant liability	2,602,000	336,000
Deferred rent liability, less current portion	5,455,000	6,102,000
Deferred revenue, less current portion	240,919,000	704,000
Total liabilities	323,838,000	29,942,000
Commitments and contingencies (Note 8)
Convertible preferred stock: $0.0001 par value, 93,762,517 shares authorized at June 30, 2019 and December 31, 2018, respectively; 93,039,737 and 92,790,094 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively; aggregate liquidation preference of $574,374 and $572,866 at June 30, 2019 and December 31, 2018, respectively	561,931,000	560,858,000
Shareholders’ deficit
Common stock: $0.0001 par value, 131,000,000 shares authorized at June 30, 2019 and December 31, 2018, respectively; 13,725,381 and 12,841,536 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	1,000	1,000
Additional paid-in capital	46,160,000	37,902,000
Accumulated other comprehensive gain (loss)	382,000	(107,000)
Accumulated deficit	(330,917,000)	(295,908,000)
Total shareholders’ deficit	(284,374,000)	(258,112,000)
Total liabilities, convertible preferred stock and shareholders’ deficit	$ 601,395,000	$ 332,688,000