Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 205,177	$ 76,564
Accounts receivable, net of allowances of $139 and $150	24,533	20,426
Inventories	15,505	11,987
Prepaid expenses and other current assets	2,835	3,173
Total current assets	248,050	112,150
Property, plant and equipment, net	77,720	55,778
Operating lease right-of-use assets	12,996	13,531
Other long-term assets	2,240	1,495
Total assets	341,006	182,954
Current liabilities:
Accounts payable	30,069	17,440
Accrued expenses	7,737	10,819
Current portion of prepayment liability	5,000	4,728
Deferred revenue	1,201	1,321
Operating lease liabilities	2,194	2,247
Total current liabilities	46,201	36,555
Prepayment liability		5,000
Convertible note - related party	100,638
Operating lease liabilities long-term	12,556	12,991
Total liabilities	159,395	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 March 31, 2022 and December 31, 2021
Common stock, $0.00001 par value; 125,000,000 shares authorized, 35,918,281 and 33,218,115 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively		0
Additional paid-in capital	746,148	673,461
Accumulated deficit	(564,537)	(545,053)
Total stockholders’ equity	181,611	128,408
Total liabilities and stockholders’ equity	$ 341,006	$ 182,954