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Stockholders' Equity - Warrants Activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Feb. 28, 2014
Shares    
Outstanding, ending balance 132,000  
Common Stock Warrant    
Shares    
Outstanding, beginning balance 191,000  
Issued 0  
Exercised 0  
Canceled (59,288)  
Outstanding, ending balance 132,000  
Weighted Average Exercise Price    
Outstanding, beginning balance, weighted-average exercise price $ 9.96  
Issued, weighted-average exercise price 0.00  
Exercised, weighted-average exercise price 0.00  
Canceled, weighted average exercise price 10.31  
Outstanding, ending balance, weighted-average exercise price $ 9.80  
2014 Loan and Security Agreement | Term Loan    
Weighted Average Exercise Price    
Credit facility, remaining borrowing capacity   $ 10,000,000.0