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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

 

 

278

 

 

$

30.50

 

Exercised

 

 

(40

)

 

$

33.80

 

Balance at December 31, 2014

 

 

238

 

 

$

30.00

 

Exercised

 

 

(235

)

 

$

30.00

 

Cancelled

 

 

(3

)

 

$

30.00

 

Balance at December 31, 2015

 

 

—

 

 

$

—