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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenues $ 56,191 $ 9,389 $ 109,475 $ 19,163
Cost of revenues 30,789 4,262 59,523 8,778
Gross margin 25,402 5,127 49,952 10,385
Operating costs and expenses:        
Selling, general and administrative 24,688 9,026 46,076 16,138
Engineering and development 4,462 1,947 8,766 3,679
Total operating costs and expenses 29,150 10,973 54,842 19,817
Loss from operations (3,748) (5,846) (4,890) (9,432)
Other income (expense):        
Investment income 368 313 766 620
Interest expense (1,164) (398) (2,373) (401)
Other income (expense), net (346) 178 (881) (450)
Total other expense, net (1,142) 93 (2,488) (231)
Loss before provision for income taxes (4,890) (5,753) (7,378) (9,663)
Provision for income taxes (499) (50) (1,538) (83)
Net loss (5,389) (5,803) (8,916) (9,746)
Paid-in-kind dividend on Series C convertible preferred stock (2,000)   (4,196)  
Net loss attributable to common stockholders $ (7,389) $ (5,803) $ (13,112) $ (9,746)
Net loss per share attributable to common stockholders - basic and diluted $ (0.16) $ (0.15) $ (0.29) $ (0.26)
Weighted average common shares outstanding - basic and diluted 45,757,532 38,281,087 44,786,403 37,914,818
Service [Member]        
Revenues $ 29,679 $ 9,389 $ 56,443 $ 19,163
Cost of revenues 16,742 $ 4,262 32,294 $ 8,778
Product [Member]        
Revenues 26,512   53,032  
Cost of revenues $ 14,047   $ 27,229