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Net loss per share
6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Net loss per share Net loss per share
Earnings per share are calculated in accordance with ASC Topic 260: "Earnings per Share", which specifies the computation, presentation and disclosure requirements for earnings per share (EPS).  It requires the presentation of basic and diluted EPS.  Basic EPS excludes all dilution and is based upon the weighted average number of shares of common stock outstanding during the period.  Diluted EPS reflects the potential dilution that would occur if convertible securities or other contracts to issue common stock were exercised. For the six months ended June 30, 2020, there were 928,000 anti-dilutive stock options outstanding compared to 469,000 as of June 30, 2019. The potential dilutive effect of the 2024 Notes and the 2026 Notes conversion features (See Note 8 - Debt) were excluded from diluted net loss per share as of June 30, 2020 and June 30, 2019. Potential shares from the 2024 Notes and the 2026 Notes conversion features at their respective initial conversion prices of $28.55 per share and $42.97 per share are approximately 481,548 and 2,792,664, respectively.

The following is a reconciliation of the weighted average of shares of common stock outstanding for the basic and diluted EPS computations:
(in thousands, except per share data)Three Months Ended June 30,Six Months Ended June 30,
 2020201920202019
Net loss$(8,976) $(1,109) $(19,886) $(3,838) 
Basic:    
Shares outstanding at beginning of period18,244  16,044  16,629  16,041  
Weighted average shares issued during the period, net—  246  1,463  44  
Weighted average common shares, basic18,244  16,290  18,092  16,085  
Net loss per common share, basic$(0.49) $(0.07) $(1.10) $(0.24) 
Diluted:    
Weighted average common shares, basic18,244  16,290  18,092  16,085  
Weighted average common shares, diluted18,244  16,290  18,092  16,085  
Net loss per common share, diluted$(0.49) $(0.07) $(1.10) $(0.24)