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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 2018: 
Shareholders’ Equity:
 
2018
 
 
 
Shareholders’ equity - January 1,
 
$
85,580

Net loss
 
(31,445
)
Other comprehensive loss
 
(385
)
Exercise of stock options
 
535

Stock-based compensation expense  
 
7,190

Employee share purchase plan share issuance
 
127

Share repurchases
 
(27,637
)
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 - September 30,
 
$
65,742