Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 162,185	$ 76,564
Accounts receivable, net of allowances of $142 and $150	29,481	20,426
Inventories	17,000	11,987
Prepaid expenses and other current assets	4,616	3,173
Total current assets	213,282	112,150
Property, plant and equipment, net	122,206	55,778
Operating lease right-of-use assets	17,892	13,531
Other long-term assets	2,554	1,495
Total assets	355,934	182,954
Current liabilities:
Accounts payable	51,126	17,440
Accrued expenses	10,973	10,819
Current portion of prepayment liability	5,000	4,728
Deferred revenue	1,616	1,321
Operating lease liabilities	2,488	2,247
Total current liabilities	71,203	36,555
Prepayment liability		5,000
Convertible note - related party	102,721
Operating lease liabilities long-term	17,256	12,991
Total liabilities	191,180	54,546
Commitments and contingencies (Note 10)
Stockholders’ equity:
Preferred stock, $0.00001 par value; 5,000,000 shares authorized, no shares issued and outstanding at June 30, 2022 and December 31, 2021
Common stock, $0.00001 par value; 125,000,000 shares authorized, 36,478,284 and 33,218,115 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively		0
Additional paid-in capital	753,341	673,461
Accumulated deficit	(588,587)	(545,053)
Total stockholders’ equity	164,754	128,408
Total liabilities and stockholders’ equity	$ 355,934	$ 182,954