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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenues $ 56,693 $ 11,172 $ 166,168 $ 30,335
Cost of revenues 33,180 5,117 92,704 13,895
Gross margin 23,513 6,055 73,464 16,440
Operating costs and expenses:        
Selling, general and administrative 23,901 14,476 69,977 30,613
Engineering and development 4,188 2,312 12,953 5,991
Total operating costs and expenses 28,089 16,788 82,930 36,604
Loss from operations (4,576) (10,733) (9,466) (20,164)
Other income (expense):        
Investment income 851 188 1,618 808
Interest expense (1,189) (1,889) (3,563) (2,290)
Other income (expense), net (588) 987 (1,469) 536
Total other expense, net (926) (714) (3,414) (946)
Loss before provision for income taxes (5,502) (11,447) (12,880) (21,110)
(Provision for) benefit from income taxes (1,024) 29 (2,562) (54)
Net loss (6,526) (11,418) (15,442) (21,164)
Paid-in-kind dividend on Series C convertible preferred stock (2,000)   (6,196)  
Net loss attributable to common stockholders $ (8,526) $ (11,418) $ (21,638) $ (21,164)
Net loss per share attributable to common stockholders - basic $ (0.18) $ (0.29) $ (0.48) $ (0.55)
Net loss per share attributable to common stockholders - diluted $ (0.17) $ (0.29) $ (0.46) $ (0.55)
Weighted average common shares outstanding - basic 46,137,147 39,144,916 45,220,319 38,211,327
Weighted average common shares outstanding - diluted 46,137,147 39,144,916 45,220,319 38,211,327
Service [Member]        
Revenues $ 30,899 $ 11,172 $ 87,342 $ 30,335
Cost of revenues 18,114 $ 5,117 50,409 $ 13,895
Product [Member]        
Revenues 25,794   78,826  
Cost of revenues $ 15,066   $ 42,295