Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (48,439,000)	$ (19,574,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Loss on extinguishment of debt	22,130,000
Stock-based compensation expense	5,861,000	3,313,000
Interest on milestone payment	3,663,000
Loss (gain) on foreign currency translation	(2,935,000)	71,000
Depreciation, amortization and accretion	1,671,000	1,105,000
Interest expense on Mann Group promissory notes	1,398,000	2,536,000
Amortization of right-of-use assets	668,000	576,000
Asset impairment		1,889,000
Write-off of inventory	0	496,000
Other, net		19,000
Changes in operating assets and liabilities:
Accounts receivable, net	(2,087,000)	147,000
Inventory	(2,509,000)	(164,000)
Prepaid expenses and other current assets	(502,000)	1,352,000
Other assets	(202,000)	82,000
Accounts payable	1,904,000	1,032,000
Accrued expenses and other current liabilities	3,215,000	(1,343,000)
Deferred revenue	(13,222,000)	(3,803,000)
Operating lease liabilities	(1,554,000)	(1,401,000)
Recognized loss on purchase commitments	(3,636,000)	(1,236,000)
Deposits from customer	5,317,000
Accrued interest on Mann Group promissory notes	(4,919,000)
Net cash used in operating activities	(34,178,000)	(14,903,000)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of debt securities	(138,920,000)
Purchase of available-for-sale securities	(3,000,000)
Purchase of property and equipment	(2,030,000)	(300,000)
Proceeds from sale of treasury bills		20,000,000
Net cash (used in) provided by investing activities	(143,950,000)	19,700,000
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from the Senior convertible notes	230,000,000
Issuance costs associated with Senior convertible notes	(7,268,000)
Principal payments on Mann Group promissory notes	(35,051,000)
Payment of MidCap credit facility	(10,000,000)
Payment of MidCap credit facility prepayment penalty	(1,000,000)
Milestone payment	5,000,000
Payment of employment taxes related to vested restricted stock units and exercise of stock options	(148,000)	(201,000)
Proceeds from market price stock purchase	106,000	14,000
Issuance of common stock from the exercise of warrants		11,600,000
Proceeds from PPP loan		4,873,000
Net cash provided by financing activities	173,487,000	28,519,000
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	(4,641,000)	33,316,000
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	67,163,000	30,222,000
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	62,522,000	63,538,000
SUPPLEMENTAL CASH FLOWS DISCLOSURES:
Interest paid in cash, net of amounts capitalized	6,717,000	1,820,000
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Non-cash construction in progress and property and equipment	1,183,000
Payment of interest through common stock issuance	143,000	144,000
Issuance of common stock under Employee Stock Purchase Plan	390,000	318,000
Payment of principal on Senior convertible notes through issuance of common stock		2,630,000
Receivable from at-the-market offering		470,000
2024 Convertible Notes
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Payment of 2024 convertible notes through issuance of common stock	5,000,000
Mann Group
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Premium on convertible note	22,107,000
Payment of convertible notes through common stock issuance	9,573,000
Payment of interest through common stock issuance	427,000
At The Market Issuance
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from at-the-market offering	1,886,000	12,564,000
Issuance costs associated with at-the-market offering	$ (38,000)	$ (331,000)