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Common Stock Warrants (Tables)
 12 Months Ended
Dec. 31, 2016
Text Block [Abstract]  
Schedule of Common Stock Warrant Activity of the Company

The following is a description of the common stock warrant activity of the Company:

 

(in thousands, except per share amounts)

 

Warrants

for the

Purchase of

Common Stock

 

 

Weighted

Average

Exercise

Price

 

Balance at December 31, 2013

 

 

2,777

 

 

$

3.05

 

Exercised

 

 

(396

)

 

$

3.38

 

Balance at December 31, 2014

 

 

2,381

 

 

$

3.00

 

Exercised

 

 

(2,355

)

 

$

3.00

 

Cancelled

 

 

(26

)

 

$

3.00

 

Balance at December 31, 2015

 

 

—

 

 

$

—