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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:    
Net loss $ (58,417) $ (45,394)
Adjustments to reconcile net loss to cash flows used in operating activities:    
Amortization of intangible assets 2,460 2,460
Depreciation of property and equipment 311 189
Amortization of debt discount 628 745
Non-cash interest expense 0 977
(Gain) loss on extinguishment of debt (2,065) 905
Provision for excess and obsolescence inventory 1,278 0
Stock-based compensation 7,447 5,547
Changes in operating assets and liabilities:    
Accounts receivable and other current assets (10,603) 4,846
Inventory 1,347 (3,200)
Accounts payable and accrued expenses 8,476 1,872
Right-of-use assets and operating lease liabilities (28) 72
Deferred revenue (931) 16,546
Net cash used in operating activities (50,097) (14,435)
Cash flows from investing activities:    
Purchases of marketable securities (32,965) 0
Purchases of property and equipment (156) (362)
Net cash used in investing activities (33,121) (362)
Cash flows from financing activities:    
Proceeds from issuance of stock and pre-funded warrants, net of issuance costs 216,825 49,918
Proceeds under paycheck protection program loan 0 2,041
Payment of long-term debt principal 0 (13,794)
Payment of extinguishment of debt costs 0 (828)
Net settlement of stock units to satisfy statutory tax withholding (150) (90)
Proceeds from exercise of stock options 373 294
Principal payments on finance lease obligations (146) (49)
Net cash provided by financing activities 216,902 37,492
Effect of foreign exchange rate changes on cash and cash equivalents 0 0
Net increase (decrease) in cash, cash equivalents and restricted cash 133,684 22,695
Cash, cash equivalents and restricted cash at beginning of year 45,059 22,364
Cash, cash equivalents and restricted cash at end of year 178,743 45,059
Supplemental cash flow information:    
Cash interest paid 4,846 5,510
Supplemental disclosure of non-cash investing and financing activities:    
Stock issuance costs 294 0
Accrued term loan exit fee 0 122
Payments forgiven under paycheck protection program loan $ 2,041 $ 0