Leadership Changes and Restructuring Activities (Details) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 09, 2016	Apr. 30, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Severance, separation and restructuring
Severance related expenses					$ 1,043,000
Equity-based compensation expense					1,311,000	$ 668,000
Selling, Operating and Administrative Expenses
Severance, separation and restructuring
Total costs, severance and other related expenses			$ 0	$ 588,000	1,043,000,000	$ 1,039,000,000
Separation And Transition Agreement
Severance, separation and restructuring
Equity-based compensation expense					331,000
Separation And Transition Agreement | Selling, Operating and Administrative Expenses
Severance, separation and restructuring
Total costs, severance and other related expenses					1,043,000
Retirement Agreement | Selling, Operating and Administrative Expenses
Severance, separation and restructuring
Total costs, severance and other related expenses							$ 877,000
Equity-based compensation expense							216,000
Retirement Agreement | Accounts Payable and Accrued Liabilities
Severance, separation and restructuring
Reserve for severance and related benefits, current			255,000		255,000		250,000
Retirement Agreement | Other liabilities
Severance, separation and restructuring
Reserve for severance and related benefits, noncurrent			42,000		42,000		175,000
Separation Agreement | Selling, Operating and Administrative Expenses
Severance, separation and restructuring
Total costs, severance and other related expenses								$ 3,581,000
Equity-based compensation expense								$ 1,007,000
Separation Agreement | Accounts Payable and Accrued Liabilities
Severance, separation and restructuring
Reserve for severance and related benefits, current			774,000		774,000		759,000
Separation Agreement | Other liabilities
Severance, separation and restructuring
Reserve for severance and related benefits, noncurrent			$ 395,000		395,000		$ 789,000
Former Chief Financial Officer and Chief Operating Officer | Separation And Transition Agreement
Severance, separation and restructuring
Severance related expenses		$ 575,000
Former Chief Financial Officer and Chief Operating Officer | Separation And Transition Agreement | Selling, Operating and Administrative Expenses
Severance, separation and restructuring
Equity-based compensation expense					$ 331,000
Former President | Retirement Agreement
Severance, separation and restructuring
Severance period					24 months
Former Chief Executive Officer | Separation Agreement
Severance, separation and restructuring
Severance period								36 months
Restricted Stock Units (RSUs)
Severance, separation and restructuring
Accelerated vesting of restricted stock units	12,109				43,688
Restricted Stock Units (RSUs) | Former Chief Financial Officer and Chief Operating Officer | Separation And Transition Agreement
Severance, separation and restructuring
Accelerated vesting of restricted stock units		12,109