Quarterly report pursuant to Section 13 or 15(d)

Commitments - Additional Information (Detail)

v3.19.1
Commitments - Additional Information (Detail)
1 Months Ended 3 Months Ended
Jan. 31, 2012
ft²
ExtensionOptions
Dec. 31, 2011
ExtensionOptions
Dec. 31, 2010
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Jan. 01, 2019
Loss Contingencies [Line Items]            
Non-cancellable operating lease, expiration date 2027-12   2025-12      
Extended lease agreement, date   2027-12        
Number of lease extension options | ExtensionOptions 2 2        
Lease renewal termination period 5 years 5 years        
Area of space relinquished from lease agreement | ft² 10,912          
Rent expense       $ 153,000 $ 154,000  
Operating lease, remaining lease term           9 years
Operating lease, discount rate, percent           9.93%
Cash paid for amounts included in the measurement of lease liabilities       $ 159,138