Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (25,998)	$ (12,916)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	2,806	1,935
Interest expense on financing liability	2,371
Depreciation and amortization	1,324	655
Amortization of right-of-use assets	289	309
Interest expense on promissory notes	116	1,028
Gain on foreign currency translation	(1,983)	(3,838)
Changes in operating assets and liabilities:
Accounts receivable, net	(4,829)	645
Inventory	(892)	(77)
Prepaid expenses and other current assets	(470)	356
Other assets	(320)	(97)
Accounts payable	1,745	1,124
Accrued expenses and other current liabilities	510	8,288
Deferred revenue	7,053	(7,431)
Operating lease liabilities	(572)	(333)
Recognized loss on purchase commitments	(1,502)	(2,379)
Customer deposits	2,104
Net cash used in operating activities	(18,248)	(12,731)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of debt securities	(55,988)	(30,442)
Proceeds from maturity of debt securities	26,538
Purchase of property and equipment	(5,056)	(976)
Purchase of available-for-sale securities	(5,000)
Net cash used in investing activities	(39,506)	(31,418)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from the Senior convertible notes		230,000
Issuance costs associated with Senior convertible notes		(7,268)
Payment of employment taxes related to vested restricted stock units and exercise of stock options	129	397
Proceeds from market price stock purchase plan	684	0
Net cash provided by financing activities	813	224,977
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	(56,941)	180,828
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	124,184	67,163
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	67,243	247,991
SUPPLEMENTAL CASH FLOWS DISCLOSURES:
Interest paid in cash	3,600	1,094
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Reclassification of investments from long-term to current	14,813
Common stock issuance to settle employee stock purchase plan liability	740	390
Non-cash construction in progress and property and equipment	$ 383	124
Reclassification of the PPP Loan from current to long-term		609
2024 Convertible Notes
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Payment of 2024 convertible notes through common stock issuance		5,000
Payment of interest through common stock issuance		143
Mann Group
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Payment of convertible notes through common stock issuance		9,573
Payment of interest through common stock issuance		427
At The Market Issuance
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from at-the-market offering		1,886
Issuance costs associated with at-the-market offering		$ (38)