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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2018
Stockholders' Equity Note [Abstract]  
Schedule of Stockholders Equity
The following table presents a reconciliation of the Company’s beginning and ending balances in shareholders’ equity for the three months ended March 31, 2018: 
Shareholders’ Equity:
 
2018
 
 
 
Shareholders’ equity - January 1,
 
$
85,580

Net loss
 
(12,236
)
Other comprehensive income  
 
11

Stock-based compensation expense  
 
2,134

Share repurchases
 
(20,212
)
Exercise of warrants (see Note 8)
 
2,911

Expiration of warrants (see Note 8)
 
2,167

Equity component of 2018 Notes (see Note 9)
 
26,699

Shareholders’ equity - March 31,
 
$
87,054