Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 215,256	$ 139,045
Short-term investments		56,304
Accounts receivable, net	10,711	7,377
Inventory	28,868	12,074
Prepaid expenses and other current assets	3,033	1,897
Total current assets	257,868	216,697
Operating lease right-of-use assets	7,841	8,825
Property and equipment, net	13,282	4,910
Other assets	1,667	1,506
TOTAL ASSETS	280,658	231,938
CURRENT LIABILITIES:
Accounts payable	1,972	2,790
Term notes, current portion	1,650	6,667
Accrued liabilities	16,662	13,777
Lease liability, current portion	841	774
Total current liabilities	21,125	24,008
Lease liability, noncurrent portion	7,685	8,125
Term notes, noncurrent portion	14,801	7,152
TOTAL LIABILITIES	43,611	39,285
STOCKHOLDERS’ EQUITY:
Preferred stock
Common stock	34	31
Additional paid-in capital	464,812	370,561
Accumulated other comprehensive income		35
Accumulated deficit	(227,799)	(177,974)
TOTAL STOCKHOLDERS’ EQUITY	237,047	192,653
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 280,658	$ 231,938