Accounts Payable and Accrued Expenses - Exit or Disposal Activities - Additional Information (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) Position
Payables And Accruals [Line Items]
Number of positions eliminated | Position	23
Other restructuring costs	$ 0
One-Time Employee Termination Benefits [Member]
Payables And Accruals [Line Items]
Severance cost accrued under payroll and benefits	389,000
One-Time Employee Termination Benefits [Member] | Selling, General, and Administrative Expense [Member]
Payables And Accruals [Line Items]
Severance costs	192,000
Executive Employment Contract [Member] | Selling, General, and Administrative Expense [Member]
Payables And Accruals [Line Items]
Severance costs	$ 224,000