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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenues $ 78,696 $ 33,942
Cost of revenues 42,362 16,590
Gross margin 36,334 17,352
Operating costs and expenses:    
Selling, general and administrative 56,860 31,286
Engineering and development 9,484 3,741
Total operating costs and expenses 66,344 35,027
Loss from operations (30,010) (17,675)
Other income (expense):    
Investment income 761 583
Interest expense (2,560) (1,367)
Other income (expense), net (929) 189
Total other expense, net (2,728) (595)
Loss before provision for income taxes (32,738) (18,270)
Benefit from (provision for) income taxes 45 (62)
Net loss (32,693) (18,332)
Deemed dividend on Series C convertible preferred stock (39,492)  
Paid-in-kind preferred stock dividend, including beneficial conversion feature (2,844)  
Net loss attributable to common stockholders $ (75,029) $ (18,332)
Net loss per share attributable to common stockholders - basic and diluted $ (1.94) $ (0.55)
Weighted average common shares outstanding - basic and diluted 38,582,432 33,394,285
Product [Member]    
Revenues $ 23,397  
Cost of revenues 12,841  
Service [Member]    
Revenues 55,299 $ 33,942
Cost of revenues $ 29,521 $ 16,590