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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    
Share-based compensation 1,844   1,844  
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) 3,930     3,930
Balances at Mar. 31, 2018 351,295 $ 274 426,952 (75,931)
Balances (in shares) at Mar. 31, 2018   27,388,000    
Balances at Dec. 31, 2018 315,152 $ 268 435,245 (120,361)
Balances (in shares) at Dec. 31, 2018   26,779,000    
Cumulative effect, 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 (in shares) 2,500 53,000    
Share-based compensation $ 4,140   4,140  
Tax benefit from share-based compensation (288)   (288)  
Net income (loss) (8,018)     (8,018)
Balances at Mar. 31, 2019 $ 315,322 $ 277 $ 455,696 $ (140,651)
Balances (in shares) at Mar. 31, 2019   27,743,000