Quarterly report pursuant to Section 13 or 15(d)

Debt and Interest- Additional Information (Detail)

Debt and Interest- Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Feb. 13, 2014
Debt [Line Items]      
Debt discount recorded $ 2,549,000 $ 2,009,000  
Notes Payable 33,026,000 $ 28,215,000  
Israel Discount Bank Of New York [Member]      
Debt [Line Items]      
Debt Instrument, Face Amount     $ 15,000,000
Notes Payable 14,900,000    
Debt Instrument, Collateral Amount 15,000,000    
Opus Credit Facility [Member]      
Debt [Line Items]      
Class Of Warrant Or Right Discount On Warrant 1,800,000    
Warrants and Rights Outstanding $ 9,000,000    
NSC 2017 Note [Member]      
Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 8.00%    
Debt discount recorded $ 200,000    
Debt Instrument, Face Amount $ 3,250,000    
Debt Instrument, Maturity Date, Description Each Note is due on the third anniversary of its issuance, provided that the Company may extend the maturity date for two one-year periods in its sole discretion.    
Paid-in-Kind Interest,Percentage 7.00%    
Line of Credit Facility, Current Borrowing Capacity $ 50,000,000    
Percentage Of Placement Agent Fee 10.00%    
Warrants on Sale Price of Note,Percentage 10.00%    
Proceeds from Fees Received $ 325,400    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 87,946    
NSC 2017 Note [Member] | Minimum [Member]      
Debt [Line Items]      
Debt Instrument, Face Amount $ 3,000,000    
NSC 2017 Note [Member] | Maximum [Member]      
Debt [Line Items]      
Debt Instrument, Face Amount $ 40,000,000