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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Other Comprehensive Income
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018   52,477,593      
Beginning balance at Dec. 31, 2018 $ 275,422 $ 52 $ 611,587 $ 1 $ (336,218)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock form the exercise of stock options and settlement of restricted stock units (in shares)   485,083      
Issuance of common stock from the exercise of stock options and settlement of restricted stock units 179 $ 1 178    
Stock-based compensation expense 3,282   3,282    
Net income (loss) (612)       (612)
Other comprehensive income (loss), net of tax 134     134  
Ending balance (in shares) at Mar. 31, 2019   52,962,676      
Ending balance at Mar. 31, 2019 $ 278,405 $ 53 615,047 135 (336,830)
Beginning balance (in shares) at Dec. 31, 2019 53,549,612 53,549,612      
Beginning balance at Dec. 31, 2019 $ 410,945 $ 54 631,307 249 (220,665)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock form the exercise of stock options and settlement of restricted stock units (in shares)   582,724      
Issuance of common stock from the exercise of stock options and settlement of restricted stock units 479 $ 0 479    
Stock-based compensation expense 3,944   3,944    
Net income (loss) 486       486
Other comprehensive income (loss), net of tax $ 532     532  
Ending balance (in shares) at Mar. 31, 2020 54,132,336 54,132,336      
Ending balance at Mar. 31, 2020 $ 416,386 $ 54 $ 635,730 $ 781 $ (220,179)