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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Current assets    
Trade receivables and contract assets allowance $ 2,920 $ 1,557
Stockholders' equity    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 160,000,000 160,000,000
Common stock, shares issued 55,207,446 54,099,927
Common stock, shares outstanding 55,187,711 54,080,192