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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Balances at Dec. 31, 2015 $ 210,485 $ 219 $ 283,991 $ (73,725)
Balances (in shares) at Dec. 31, 2015   21,868,000    
Proceeds from issuance of stock on options exercised 1,792 $ 3 1,789  
Proceeds from issuance of stock on options exercised (in shares)   314,000    
Share-based compensation $ 3,878   3,878  
Repurchases of common stock (in shares) 0      
Share issuance related to business combination $ 500 $ 1 499  
Share issuance related to business combination (in shares)   50,000    
Special dividend ($1.71 per share) (23,529)     (23,529)
Net income (loss) 16,300     16,300
Balances at Dec. 31, 2016 209,426 $ 223 290,157 (80,954)
Balances (in shares) at Dec. 31, 2016   22,232,000    
Proceeds from issuance of stock on options exercised 169 $ 1 168  
Proceeds from issuance of stock on options exercised (in shares)   135,000    
Share-based compensation $ 8,754   8,754  
Repurchases of common stock (in shares) 0      
Tax benefit from share-based compensation $ (1,015)   (1,015)  
Share issuance related to business combination 101,486 $ 40 101,446  
Share issuance related to business combination (in shares)   4,046,000    
Cumulative effect, change in accounting for revenue recognition related to business combination (991)     (991)
Net income (loss) 2,084     2,084
Balances at Dec. 31, 2017 319,913 $ 264 399,510 (79,861)
Balances (in shares) at Dec. 31, 2017   26,413,000    
Proceeds from issuance of stock on options exercised $ 1,322 $ 6 1,316  
Proceeds from issuance of stock on options exercised (in shares) 813,228 610,000    
Share-based compensation $ 9,641   9,641  
Repurchases of common stock $ (19,598) $ (12)   (19,586)
Repurchases of common stock (in shares) (1,200,000) (1,219,000)    
Tax benefit from share-based compensation $ (820)   (820)  
Issuance of common stock, net of offering costs 25,608 $ 10 25,598  
Issuance of common stock, net of offering costs (in shares)   975,000    
Net income (loss) (20,914)     (20,914)
Balances at Dec. 31, 2018 $ 315,152 $ 268 $ 435,245 $ (120,361)
Balances (in shares) at Dec. 31, 2018   26,779,000