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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ 2,423,000 $ (12,612,000) $ (28,900,000)
Adjustments to reconcile net income (loss) to cash used in operating activities:      
Change in fair value of common stock warrant liabilities (8,161,000) 8,495,000  
Depreciation 74,000 34,000  
Lease amortization 223,000 172,000  
Net amortization of investment premium (39,000) (39,000)  
Stock-based compensation 772,000 422,000  
Write down of inventory 59,000 0  
Changes in operating assets and liabilities:      
Accounts receivable 293,000 86,000  
Inventories (4,145,000) 39,000  
Prepaid expenses and other current assets (748,000) 200,000  
Other noncurrent assets (15,000)    
Accounts payable and accrued expenses 227,000 (538,000)  
Amounts due to related parties (24,000) (16,000)  
Unearned revenue (25,000) (40,000)  
Operating lease payments (184,000) (172,000)  
Net cash used in operating activities (9,270,000) (3,969,000) (17,200,000)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchases of property and equipment (778,000) (88,000)  
Purchases of investments (1,292,000) (6,690,000)  
Proceeds from sales and maturities of investments 15,200,000 9,200,000  
Net cash provided by investing activities 13,130,000 2,422,000  
CASH FLOWS FROM FINANCING ACTIVITIES:      
Payments of deferred offering costs   (5,000)  
Principal payments on notes payable (7,000)    
Proceeds from ESPP purchases 14,000 8,000  
Capital contributions received from non-controlling interest 689,000    
Net cash provided by (used in) financing activities 696,000 (13,000)  
Net increase (decrease) in cash and cash equivalents 4,556,000 (1,560,000)  
Cash and cash equivalents — beginning of period 8,417,000 11,998,000 11,998,000
Cash and cash equivalents — end of period 12,973,000 10,438,000 $ 8,417,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:      
Cash paid for income taxes   2,000  
Cash paid for interest 3,000    
NONCASH INVESTING AND FINANCING ACTIVITIES:      
Fixed assets acquired with notes payable 37,000    
Offering costs in accounts payable and accrued expenses at end of period   7,000  
Deferred offering costs in accounts payable and accrued expenses at end of period   18,000  
Right of use assets obtained in exchange for new operating lease liabilities $ 3,836,000 2,328,000  
Purchases of fixed assets included in accounts payable and accrued expenses   13,000  
June 2018 Offering [Member]      
CASH FLOWS FROM FINANCING ACTIVITIES:      
Payments of offering costs   $ (16,000)