Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 96,630	$ 149,103
Prepaid expenses and other current assets	10,261	10,499
Total current assets	106,891	159,602
Restricted cash	2,637	2,637
Deferred lease asset	655	667
Property, plant and equipment, net	55,120	50,610
Other non-current assets	673	440
Total assets	165,976	213,956
Current liabilities
Accounts payable	21,997	21,763
Accrued expenses and other current liabilities	26,620	29,983
Total current liabilities	48,617	51,746
Build-to-suit lease liability	25,752	25,900
Term loan, net	37,386	37,192
Other non-current liabilities	3,496	3,735
Total liabilities	115,251	118,573
Commitments and contingencies - Note 9
Stockholders' equity
Preferred stock, $0.00001 par value per share; 10,000,000 shares authorized and no shares issued and outstanding as of March 31, 2022 and December 31, 2021
Common stock, $0.00001 par value per share; 200,000,000 shares authorized and 38,473,945 issued and outstanding as of March 31, 2022 and December 31, 2021
Additional paid-in capital	336,485	331,032
Accumulated deficit	(285,760)	(235,649)
Total stockholders’ equity	50,725	95,383
Total liabilities and stockholders' equity	$ 165,976	$ 213,956