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Stock Warrants (Tables)
12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Warrant Activity
A summary of stock warrant activity is as follows:
 
Outstanding Warrants
(thousands)
Weighted-Average Exercise Price
Outstanding at December 31, 2011
158

$
5.25

Granted


Cancelled
(114
)
$
4.15

Outstanding at December 31, 2012
44

$
1.50

Granted


Cancelled or expired


Outstanding at December 31, 2013
44

$
1.50

Vested at December 31, 2013
22

$
1.50