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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues $ 87,125 $ 63,838
Cost of revenues 69,671 54,393
Gross profit 17,454 9,445
Operating expenses:    
Research and development 11,015 9,565
Selling, general and administrative 25,322 22,669
Amortization of acquisition related intangibles 1,222 340
Change in fair value of contingent consideration 3,060
Total operating expenses 40,619 32,574
Operating loss (23,165) (23,129)
Change in fair value of warrants 4,648
Interest income, net 426 1,327
Other (expense) income, net (771) 253
Loss before income tax expense (23,510) (16,901)
Income tax (benefit) expense (832) 195
Net loss $ (22,678) $ (17,096)
Net loss per common share    
Basic (in dollars per share) $ (0.95) $ (0.81)
Diluted (in dollars per share) $ (0.95) $ (1.03)
Weighted average number of common shares outstanding    
Basic (in shares) 23,879 20,985
Diluted (in shares) 23,879 21,069