Equity - Restricted Stock Units (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Restricted Stock Units
Granted (in shares)					513,678
Weighted-Average Grant-Date Fair Value
Outstanding at the end of the period (in shares)	150,444		150,444		150,444
Unrecognized compensation cost
Stock based compensation expense recognized					$ 0
Vesting period					3 years
If less than 80 percent of performance target is reached					0.00%
RSUs
Restricted Stock Units
Outstanding at the beginning of the period (in shares)			800,843
Granted (in shares)			510,000
Vested (in shares)			135,553
Forfeited (in shares)			115,000
Outstanding at the end of the period (in shares)	1,060,290		1,060,290		800,843
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)			$ 4.65
Granted (in dollars per share)			2.24
Vested (in dollars per share)			4.34
Forfeited (in dollars per share)			2.88
Outstanding at the end of the period (in dollars per share)	$ 3.72		$ 3.72		$ 4.65
Unrecognized compensation cost
Weighted-average period for recognition of unrecognized compensation cost			1 year 9 months 18 days
Stock based compensation expense recognized	$ 400,000	$ 300,000	$ 1,300,000	$ 1,400,000
Total unrecognized compensation	$ 2,700,000		$ 2,700,000