Leadership Changes and Restructuring Activities (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Severance and other related expenses				$ 1,043,000
Equity-based compensation expense		$ 501,000	$ 430,000	1,812,000	$ 1,098,000
Selling, Operating and Administrative Expenses
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Severance and other related expenses		0	$ 503,000	1,043,000	$ 1,542,000
Separation And Transition Agreement
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Equity-based compensation expense				331,000
Separation And Transition Agreement | Selling, Operating and Administrative Expenses
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Severance and other related expenses				1,043,000
Retirement Agreement | Selling, Operating and Administrative Expenses
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Severance and other related expenses						$ 877,000
Equity-based compensation expense						216,000
Retirement Agreement | Accounts Payable and Accrued Liabilities
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Reserve for severance and related benefits current		237,000		237,000		250,000
Retirement Agreement | Other liabilities
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Reserve for severance and related benefits noncurrent		0		0		175,000
Separation Agreement | Selling, Operating and Administrative Expenses
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Severance and other related expenses				0
Equity-based compensation expense	$ 1,007,000
Severance liability	$ 3,581,000
Severance and related benefits recognized to date				3,557,000
Separation Agreement | Accounts Payable and Accrued Liabilities
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Reserve for severance and related benefits current		781,000		781,000		759,000
Separation Agreement | Other liabilities
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Reserve for severance and related benefits noncurrent		$ 198,000		198,000		$ 789,000
Former Chief Financial Officer and Chief Operating Officer | Separation And Transition Agreement | Selling, Operating and Administrative Expenses
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Equity-based compensation expense				$ 331,000
Former President | Retirement Agreement
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Severance period				24 months
Former Chief Executive Officer | Separation Agreement
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Severance period							36 months