CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 469,405	$ 24,624
Marketable securities	53,472
Accounts receivable	245	141
Inventories	1,529	1,219
Other current assets	2,043	4,970
Total current assets	526,694	30,954
Operating lease right-of-use assets	6,134
Property, plant and equipment, net	2,281	1,614
Other noncurrent assets	360	64
Total assets	535,469	32,632
Liabilities, convertible preferred stock and stockholders' equity
Accounts payable	2,576	2,071
Accrued liabilities	1,840	2,606
Accrued employee costs	364	722
Lease liability, current portion	1,293
Other current liabilities	284	275
Total current liabilities	6,357	5,674
Lease liability, noncurrent portion	4,849
Warrant liability	2,346
Other liabilities		45
Total liabilities	13,552	5,719
Commitments and contingencies (Note 13)
Convertible preferred stock $0.0001 par value; 10,000 shares authorized; no shares issued and outstanding	0	0
Stockholders' Deficit
Common stock $0.0001 par value; 422,000 shares authorized; 211,410 and 151,366 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively	21	15
Additional paid-in capital	602,467	87,982
Accumulated other comprehensive loss	(29)
Accumulated deficit	(80,542)	(61,084)
Total stockholders' equity	521,917	26,913
Total liabilities, convertible preferred stock and stockholders' equity	$ 535,469	$ 32,632