Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 45,083	$ 87,880
Prepaid expenses and other current assets	9,032	8,537
Total current assets	54,115	96,417
Restricted cash	2,637	2,637
Property, plant and equipment, net	14,139	14,963
Operating lease right-of-use assets	10,348	10,943
Other non-current assets	304	1,316
Total assets	81,543	126,276
Current liabilities
Accounts payable	10,766	10,946
Accrued expenses and other current liabilities	19,632	18,287
Deferred revenue	20,243	33,557
Total current liabilities	50,641	62,790
Deferred revenue, net of current portion	6,212
Term loan, net	38,354	37,967
Operating lease liability, net of current portion	19,528	20,440
Other non-current liabilities	3,922	4,130
Total liabilities	118,657	125,327
Commitments and contingencies - Note 12
Stockholders' (deficit) equity
Preferred stock, $0.00001 par value per share; 10,000,000 shares authorized and no shares issued and outstanding as of June 30, 2023 and December 31, 2022
Common stock, $0.00001 par value per share; 200,000,000 shares authorized and 64,432,637 and 63,207,507 issued and outstanding as of June 30, 2023 and December 31, 2022, respectively	1	1
Additional paid-in capital	406,546	402,389
Accumulated deficit	(443,661)	(401,441)
Total stockholders' (deficit) equity	(37,114)	949
Total liabilities and stockholders' (deficit) equity	$ 81,543	$ 126,276