Leadership Changes and Restructuring Activities (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2014	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2014
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Equity-based compensation expense		$ 732,000	$ 545,000	$ 1,293,000	$ 1,311,000
Selling, General and Administrative Expenses [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Severance and other related expenses		$ 0		$ 0	1,043,000
Former Chief Financial Officer and Chief Operating Officer | Separation And Transition Agreement | Selling, General and Administrative Expenses [Member]
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					$ 331,000
Former Chief Executive Officer | Separation Agreement
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Severance period						36 months
Former Chief Executive Officer | Separation Agreement | Selling, General and Administrative Expenses [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Equity-based compensation expense	$ 1,007,000
Severance liability	$ 3,581,000					$ 3,581,000