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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
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 1,273 $ 6 1,267  
Proceeds from issuance of stock on options exercised (in shares)   564,000    
Share-based compensation 7,063   7,063  
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    
Tax benefit from share-based compensation (820)   (820)  
Net income (loss) 4,400     4,400
Balances at Sep. 30, 2018 357,437 $ 280 432,618 (75,461)
Balances (in shares) at Sep. 30, 2018   27,952,000    
Balances at Jun. 30, 2018 356,787 $ 274 428,850 (72,337)
Balances (in shares) at Jun. 30, 2018   27,430,000    
Proceeds from issuance of stock on options exercised 856 $ 6 850  
Proceeds from issuance of stock on options exercised (in shares)   522,000    
Share-based compensation 2,501   2,501  
Tax benefit from share-based compensation 417   417  
Net income (loss) (3,124)     (3,124)
Balances at Sep. 30, 2018 357,437 $ 280 432,618 (75,461)
Balances (in shares) at Sep. 30, 2018   27,952,000    
Balances at Dec. 31, 2018 315,152 $ 268 435,245 (120,361)
Balances (in shares) at Dec. 31, 2018   26,779,000    
Cumulative effect of change in accounting for leases, net of tax (ASU 842 [Member]) at Dec. 31, 2018 (12,272)     (12,272)
Issuance of common stock related to business combination 16,608 $ 9 16,599  
Issuance of common stock related to business combination (In Shares)   911,000    
Proceeds from issuance of stock on options exercised $ 56 $ 1 55  
Proceeds from issuance of stock on options exercised (in shares) 90,890 123,000    
Share-based compensation $ 8,840   8,840  
Tax benefit from share-based compensation (300)   (300)  
Net income (loss) (31,873)     (31,873)
Balances at Sep. 30, 2019 296,211 $ 278 460,439 (164,506)
Balances (in shares) at Sep. 30, 2019   27,813,000    
Balances at Jun. 30, 2019 303,089 $ 278 457,870 (155,059)
Balances (in shares) at Jun. 30, 2019   27,800,000    
Proceeds from issuance of stock on options exercised (in shares)   13,000    
Share-based compensation 2,578   2,578  
Tax benefit from share-based compensation (9)   (9)  
Net income (loss) (9,447)     (9,447)
Balances at Sep. 30, 2019 $ 296,211 $ 278 $ 460,439 $ (164,506)
Balances (in shares) at Sep. 30, 2019   27,813,000