Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Additional Information (Details Textuals)

v3.8.0.1
Financial Instruments - Additional Information (Details Textuals)
3 Months Ended
Mar. 31, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount $ 0
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net $ 0