XML 40 R27.htm IDEA: XBRL DOCUMENT v3.5.0.2
Business and Basis of Presentation (Additional Information) (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 13, 2016
Jan. 12, 2016
Mar. 18, 2015
Jun. 30, 2015
Jun. 30, 2016
Jul. 29, 2016
May 10, 2016
May 09, 2016
Dec. 31, 2015
Dec. 31, 2014
May 08, 2013
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Cash and cash equivalents       $ 45,279,000 $ 19,590,000       $ 29,730,000 $ 23,650,000  
Restricted cash         $ 24,401,000       $ 401,000    
Highly-liquid debt instruments maturity days       90 days              
Issuance of common stock, shares   19,772,727 24,358,974                
Stock purchase price per share (usd per share)   $ 1.10                  
Exercise price (usd per share)   $ 1.42 $ 2.08       $ 1.51       $ 2.47
Minimum [Member] | Equipment and Furnishings [Member]                      
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Estimated useful lives         3 years            
Maximum [Member] | Equipment and Furnishings [Member]                      
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Estimated useful lives         5 years            
Senior Secured Debentures [Member]                      
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Debt instrument, face amount         $ 25,500,000.0            
Restriction of funds, period (in days)         75 days            
Subsequent Event [Member]                      
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Proceeds from issuance of warrants $ 11,700,000                    
Exercise price (usd per share) $ 0.65         $ 0.43   $ 1.51      
Subsequent Event [Member] | Senior Secured Debentures [Member]                      
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Debt instrument, face amount               $ 25,530,000      
Subsequent Event [Member] | Common Stock [Member]                      
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Issuance of common stock, shares 28,000,000                    
Stock purchase price per share (usd per share) $ 0.45                    
New warrants issued during period (in shares) 14,000,000