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Stockholders' Equity - Reverse Stock Split - Additional Information (Details)
Nov. 06, 2017
$ / shares
shares
Jul. 21, 2016
$ / shares
shares
Jul. 19, 2016
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Jul. 18, 2016
shares
Dec. 31, 2015
$ / shares
Stockholders Equity Note [Line Items]              
Reverse stock split ratio 0.0029 0.0625          
Number of fractional shares were issued in connected with the reverse stock split   0          
Common stock, par value (in dollars per share) | $ / shares   $ 0.01   $ 0.01 $ 0.01   $ 0.01
Common stock, shares authorized (in shares)     500,000,000 500,000,000 500,000,000 170,000,000  
Minimum [Member]              
Stockholders Equity Note [Line Items]              
Reverse stock split ratio     0.1        
Maximum [Member]              
Stockholders Equity Note [Line Items]              
Reverse stock split ratio     0.05        
OTCQB [Member]              
Stockholders Equity Note [Line Items]              
Reverse stock split ratio 0.0029            
Number of fractional shares were issued in connected with the reverse stock split 0            
Common stock, par value (in dollars per share) | $ / shares $ 0.01