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Stock Warrants
 12 Months Ended
Dec. 31, 2016
Stockholders' Equity Note [Abstract]  
Stock Warrants
Stock Warrants
 
Stock warrants as of December 31, 2016, 2015 and 2014 consisted of:
 
 
 
2016
 
2015
 
2014
 
 
Warrants
 
Weighted
Average
Exercise Price
 
Warrants
 
Weighted
Average
Exercise Price
 
Warrants
 
Weighted
Average
Exercise Price
Beginning balance
 
—

 
$
—

 
84,000

 
$
1.21

 
354,546

 
$
1.21

 
 
 
 
 
 
 
 
 
 
 
 
 
Stock warrants granted
 
—

 
—

 
—

 
—

 
—

 
—

Stock warrants expired
 
—

 
—

 
(16,364
)
 
1.21

 
—

 
—

Stock warrants exercised
 
—

 
—

 
(67,636
)
 
1.21

 
(270,546
)
 
1.21

 
 
 
 
 
 
 
 
 
 
 
 
 
Ending balance
 
—

 
$
—

 
—

 
$
—

 
84,000

 
$
1.21



In connection with the private placement of the Company’s Common Stock on December 8, 2010, the Company granted common stock warrants to purchase up to 338,182 and 16,364 shares, respectively, to each of its two placement agents for $1.21 per share which expired on December 8, 2015. There were no stock warrant activities during 2016 and no outstanding warrants as of December 31, 2016.