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Commitments and Contingencies - Additional Information (Detail)
 12 Months Ended
Feb. 29, 2008
Time
Dec. 31, 2017
USD ($)
Commitments And Contingencies [Line Items]    
Lease expiration date Feb. 28, 2019  
Number of times lease can be renewed | Time 6  
Lease renewal period 5 years  
Lease amendment description   In May 2017, the Company entered into an amendment to the lease to, among other things, extend the primary lease term, and consequently the construction deadline, to a date between February 29, 2020 and June 30, 2020
Non refundable payment   $ 40,000
Purchase the premises   $ 4,500,000
Due diligence expiration date   Mar. 02, 2018
Escrow deposit to purchase the property   $ 300,000
Sale agreement termination, date   November 27, 2020
Additional Amendment Lease Agreement [Member]    
Commitments And Contingencies [Line Items]    
Lease amendment description   In November 2017, the Company entered into an additional amendment to the lease concurrently with entering into a purchase and sale agreement.