Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Narrative) (Detail)

v3.6.0.2
Commitments and Contingencies (Narrative) (Detail)
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
claim
Nov. 30, 2016
USD ($)
security_offering
Jan. 31, 2016
USD ($)
underwriter
Nov. 30, 2015
USD ($)
security_offering
firm
claim
Sep. 30, 2015
USD ($)
May 31, 2014
USD ($)
employee
Jul. 31, 2013
USD ($)
plaintiff
Jan. 31, 2015
claim
Jul. 31, 2016
claim
Feb. 29, 2016
plaintiff
claim
Dec. 31, 2015
USD ($)
Loss Contingencies [Line Items]                      
Deferred rent $ 1,764,000                   $ 1,551,000
Number of firms that underwrote security offerings | firm       9              
Number of security offerings | security_offering       6              
Accrued liabilities $ 4,396,000                   $ 1,358,000
Convertible Notes Payable                      
Loss Contingencies [Line Items]                      
Offering             $ 300,000,000        
Common Stock                      
Loss Contingencies [Line Items]                      
Offering           $ 1,656,000          
Ladenburg                      
Loss Contingencies [Line Items]                      
New claims filed | claim 5               4    
Damages sought by plaintiff $ 5,500,000                    
Number of underwriters | underwriter     1                
Compensatory damages                      
Loss Contingencies [Line Items]                      
New claims filed | claim       2       2      
Number of plaintiffs | employee           17          
Damages sought by plaintiff       $ 151,000              
Compensatory damages | Triad                      
Loss Contingencies [Line Items]                      
New claims filed | claim                   8  
Number of plaintiffs | plaintiff                   45  
Lawsuits filed, number | claim                   1  
Compensatory damages | Triad | Pending Litigation                      
Loss Contingencies [Line Items]                      
Damages sought by plaintiff         $ 3,714,000            
Compensatory damages | Ladenburg                      
Loss Contingencies [Line Items]                      
Damages sought by plaintiff   $ 105,000,000 $ 2,900,000,000                
Number of security offerings | security_offering   2                  
ARCP July 2013 Offering | Compensatory damages                      
Loss Contingencies [Line Items]                      
Number of plaintiffs | plaintiff             8