Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 91,195	$ 50,423
Short-term investments	91,759	151,931
Accounts receivable, net	29,966	11,689
Inventory	38,744	29,859
Prepaid expenses and other current assets	4,364	2,398
Total current assets	256,028	246,300
Operating lease right-of-use assets	11,790	7,568
Property and equipment, net	23,085	16,362
Equity method investment	6,408
Other assets	1,684	1,812
TOTAL ASSETS	298,995	272,042
CURRENT LIABILITIES:
Accounts payable	3,632	1,466
Term notes, current portion	2,750	3,300
Accrued liabilities	33,017	19,942
Lease liability, current portion	867	873
Total current liabilities	40,266	25,581
Lease liability, noncurrent portion	11,939	7,488
Term notes, noncurrent portion	14,226	13,319
Related party contract liability, noncurrent portion	12,273
TOTAL LIABILITIES	78,704	46,388
STOCKHOLDERS’ EQUITY:
Preferred stock
Common stock	35	35
Additional paid-in capital	486,014	469,283
Accumulated other comprehensive income (loss)	(7)	9
Accumulated deficit	(265,751)	(243,673)
TOTAL STOCKHOLDERS’ EQUITY	220,291	225,654
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 298,995	$ 272,042