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Stockholders' Equity - Issuance of Common Stock and Warrants (Details) - USD ($)
 1 Months Ended 3 Months Ended
Mar. 21, 2016
Mar. 31, 2016
Nov. 30, 2013
Apr. 03, 2016
Mar. 29, 2015
Jan. 03, 2016
Jul. 31, 2013
Class of Stock [Line Items]              
Offerings             $ 40,000,000.0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001 $ 0.001   $ 0.001  
Underwritten public offering price (in dollars per share) $ 1.00 $ 1.00 $ 2.90 $ 1.06      
Net proceeds $ 8,800,000 $ 8,800,000 $ 23,100,000 $ 10,000,000 $ 0    
Offering expenses   $ 1,200,000 $ 2,200,000 $ 1,200,000 $ 0    
Warrants outstanding (in shares)       2,300,000      
November 2009 Financing              
Class of Stock [Line Items]              
Warrants outstanding (in shares)       1,900,000      
Strike price of warrants (in dollars per share)       $ 2.15      
June 2012 Financing              
Class of Stock [Line Items]              
Warrants outstanding (in shares)       2,300,000      
Strike price of warrants (in dollars per share)       $ 2.98      
Common Stock              
Class of Stock [Line Items]              
Aggregate shares of common stock issued 10,000,000.0 10,000,000 8,740,000