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Cash, Cash Equivalents and Restricted Cash
9 Months Ended
Sep. 30, 2017
Cash And Cash Equivalents [Abstract]  
Cash, Cash Equivalents and Restricted Cash

4. Cash, Cash Equivalents and Restricted Cash

Cash

The Company considers all highly liquid money market instruments to be cash equivalents. Cash is maintained at financial institutions and, at times, balances may exceed federally insured limits of $250 at each financial institution. The Company has not experienced any losses related to these balances.

Restricted Cash

Restricted cash represents cash held as collateral relating to an outstanding short-term bond assuring performance under an agreement with a pipeline common carrier.