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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities    
Net income (loss) $ 891 $ (12,595)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 1,106 1,014
Amortization of right-of-use assets 653 634
Gain on disposal of property and equipment and from lease termination   (76)
Amortization of premium (accretion of discounts) on marketable securities 221 (87)
Change in fair value of warrant liability 25,552 (8,610)
Stock compensation expense 4,723 1,778
Cost of sales - amortization of intangible assets   2,298
Non-cash interest expense 414 1,338
Tenant improvements provided by the landlord   908
Changes in operating assets and liabilities:    
Accounts and other receivables, net (61,333) 751
Inventories, net (5,157) (6,767)
Prepaid manufacturing 3,219  
Prepaid expenses and other current assets (171) (1,000)
Other assets (95) 43
Accounts payable (295) (2,095)
Lease liabilities (751) (672)
Deferred revenue 78,340  
Accrued liabilities and other liabilities (2,847) (3,728)
Net cash provided by (used in) operating activities 38,032 (26,866)
Investing activities    
Acquisition of technology licenses   (7,000)
Purchases of marketable securities (72,016) (17,985)
Proceeds from maturities and redemptions of marketable securities 51,130 37,900
Purchases of property and equipment, net (1,747) (2,352)
Net cash (used in) provided by investing activities (22,633) 10,563
Financing activities    
Proceeds from issuance of common stock, net 28,156 14,229
Proceeds from exercise of warrants 3,377  
Proceeds (tax withholding) from exercise of stock options and restricted stock awards, net 387 (1)
Proceeds from Employee Stock Purchase Plan 383 311
Net cash provided by financing activities 32,303 14,539
Effect of exchange rate changes on cash, cash equivalents and restricted cash (731) (225)
Net increase (decrease) in cash, cash equivalents and restricted cash 46,971 (1,989)
Cash, cash equivalents and restricted cash at beginning of period 32,310 40,100
Cash, cash equivalents and restricted cash at end of period 79,281 38,111
Supplemental disclosure of cash flow information    
Cash paid during the period for interest 4,296 3,412
Non-cash investing and financing activities:    
Purchases of property and equipment, not yet paid $ 411 $ 408