Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
CURRENT ASSETS
Cash and cash equivalents	$ 363,511	$ 171,160
Short-term investments	130,532	118,955
Accounts receivable	49	0
Inventories	778	0
Prepaid expenses and other current assets	7,901	6,487
Total current assets	502,771	296,602
Property and equipment, net	13,695	14,755
Intangible assets, net	31,660	0
Operating lease right of use assets	25,366	26,531
Restricted cash	1,050	730
Other non-current assets	1,639	1,669
TOTAL ASSETS	576,181	340,287
CURRENT LIABILITIES
Accounts payable	6,603	8,010
Accruals and other current liabilities	22,245	18,636
Deferred revenue, current portion	12,255	7,911
Operating lease liabilities, current portion	3,789	3,470
Derivative liability	3,101	2,952
Derivative liability	47,993	40,979
Convertible senior notes	174,304	0
Deferred revenue, net of current portion	74,295	47,948
Operating lease liabilities, net of current portion	23,871	25,870
TOTAL LIABILITIES	320,463	114,797
Commitments and Contingencies (Note 11)
STOCKHOLDERS’ EQUITY
Preferred Stock, Value, Issued	0	0
Common Stock, Value, Issued	57	52
Additional paid-in capital	1,222,271	1,069,639
Accumulated other comprehensive income	117	3
Accumulated deficit	(966,727)	(844,204)
TOTAL STOCKHOLDERS’ EQUITY	255,718	225,490
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 576,181	$ 340,287