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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash Flows From Operating Activities:    
Net loss $ (32,693,000) $ (18,332,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 9,869,000 2,415,000
Amortization of debt discount 437,000 288,000
Interest expense on convertible note settled by issuance of common stock 0 418,000
Unrealized (gain) loss on investments in equity securities (845,000) 102,000
Realized loss on investments in equity securities 1,090,000 0
Realized (gain) loss on available-for-sale debt securities 32,000 (82,000)
Stock-based compensation expense 8,916,000 6,962,000
Accelerated stock-based compensation expense 0 9,562,000
Loss on disposal of property and equipment 384,000 274,000
Provision for bad debt 197,000 42,000
Changes in operating assets and liabilities, net of effects of acquisition:    
Accounts receivable (2,617,000) (3,596,000)
Inventories 1,322,000 (253,000)
Prepaid expenses and other current assets (7,520,000) (345,000)
Deposits (152,000) (86,000)
Change in operating lease right-of-use assets and lease liabilities 134,000 (6,000)
Accounts payable and other accrued expenses 4,245,000 570,000
Accrued compensation and related expenses 3,143,000 641,000
Deferred revenue (309,000) 81,000
Net deferred tax (asset) liability (499,000) 21,000
Net cash used in operating activities (14,866,000) (1,324,000)
Cash Flows From Investing Activities:    
Purchases of property and equipment (8,918,000) (5,336,000)
Purchases of short-term investments (158,736,000) (43,196,000)
Sales/maturities of short-term investments 149,233,000 5,995,000
Patent and trademark costs (200,000) (73,000)
Software development costs (551,000) 0
Cash paid for acquisitions (363,140,000) (20,317,000)
Net cash used in investing activities (382,312,000) (62,927,000)
Cash Flows From Financing Activities:    
Proceeds from exercise of stock options and warrants 9,388,000 5,363,000
Proceeds from issuance of Series C convertible preferred stock, net of issuance costs 237,225,000 0
Proceeds from issuance of common stock, net of issuance costs 28,160,000 0
Proceeds from public offering, net of offering costs 0 68,811,000
Repayment of finance lease liabilities (70,000) (23,000)
Proceeds from issuance of convertible senior notes 115,000,000 0
Payment of deferred financing costs (4,118,000) 0
Net cash provided by financing activities 385,585,000 74,151,000
Effect of exchange rate changes on cash and cash equivalents 1,231,000 8,000
Net change in cash and cash equivalents (10,362,000) 9,908,000
Cash and cash equivalents - beginning of year 47,235,000 37,327,000
Cash and cash equivalents - end of year 36,873,000 47,235,000
Supplemental Disclosure of Cash Flow Information:    
Cash paid for interest 1,823,000 707,000
Cash paid for income taxes 60,000 14,000
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Net unrealized gain (loss) on available-for-sale debt securities 161,000 (28,000)
Reclassification of realized gain on available-for-sale debt securities to earnings 3,000 23,000
Fixed assets included in accounts payable and accrued liabilities 499,000 261,000
Purchase of equipment through finance lease obligations 205,000 0
Paid-in-kind preferred stock dividend, including beneficial conversion feature 2,844,000 0
Common stock issued for conversion of debt and accrued interest $ 0 $ 15,418,000