Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Detail)

v3.7.0.1
Commitments and Contingencies (Detail)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 24 Months Ended
Apr. 01, 2017
USD ($)
Nov. 30, 2016
USD ($)
security_offering
Jan. 31, 2016
USD ($)
Nov. 30, 2015
USD ($)
claim
Oct. 31, 2013
plaintiff
underwriter
Jan. 31, 2015
USD ($)
note_offering
plaintiff
claim
Mar. 31, 2017
USD ($)
claim
Jul. 31, 2016
USD ($)
claim
Dec. 31, 2014
security_offering
firm
underwriter
Loss Contingencies [Line Items]                  
Number of prior note offerings | note_offering           3      
Number of firms that underwrote security offerings | firm                 9
Number of security offerings | security_offering                 6
Loss contingency accrual, product liability             $ 3,170    
Loss Contingency, Loss in Period             125    
Operating Leases, Future Minimum Payments Due             $ 50,399    
Ladenburg                  
Loss Contingencies [Line Items]                  
New claims filed, number | claim             5 4  
Number of security offerings | security_offering                 2
Damages sought by plaintiff               $ 5,500  
Number of underwriters | underwriter         1       1
Operating Leases, Future Minimum Payments Due             $ 3,818    
Securities America                  
Loss Contingencies [Line Items]                  
Number of plaintiffs | plaintiff         3        
Compensatory damages                  
Loss Contingencies [Line Items]                  
New claims filed, number | claim       2   2      
Number of plaintiffs | plaintiff           17      
Damages sought by plaintiff       $ 151,000          
Compensatory damages | Ladenburg                  
Loss Contingencies [Line Items]                  
Number of security offerings | security_offering   2              
Damages sought by plaintiff   $ 105,000 $ 2,900,000            
Convertible Notes Payable                  
Loss Contingencies [Line Items]                  
Proceeds from issuance Public Offering           $ 300,000      
Common Stock                  
Loss Contingencies [Line Items]                  
Proceeds from issuance Public Offering           $ 1,656,000      
ARCP July 2013 Offering | Compensatory damages                  
Loss Contingencies [Line Items]                  
Number of plaintiffs | plaintiff           8      
Subsequent Event                  
Loss Contingencies [Line Items]                  
Operating Leases, Reduction in Future Payments $ 300