Stock Based Compensation (Options and Warrants Outstanding by Exercise Price) (Details) - $ / shares shares in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
$0 - $1.99 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price (usd per share)	$ 0
$0 - $1.99 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price (usd per share)	1.99
$2.00 - $2.99 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price (usd per share)	2.00
$2.00 - $2.99 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price (usd per share)	2.99
$3.00 - $3.99 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price (usd per share)	3.00
$3.00 - $3.99 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price (usd per share)	3.99
$4.00 - $4.99 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price (usd per share)	4.00
$4.00 - $4.99 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price (usd per share)	4.99
$5.00 - $5.90 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price (usd per share)	5.00
$5.00 - $5.90 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price (usd per share)	$ 5.90
Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding (shares)	1,787	1,887
Weighted Average Exercise Price (usd per share)	$ 3.53	$ 3.58
Warrants | Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding (shares)	1,787
Weighted Average Remaining Contractual Term (in years)	3 years 5 months
Weighted Average Exercise Price (usd per share)	$ 3.53
Vested and Exercisable (shares)	1,695
Weighted Average Exercise Price (usd per share)	$ 3.49
Warrants | Employee | $0 - $1.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding (shares)	218
Weighted Average Remaining Contractual Term (in years)	4 months 16 days
Weighted Average Exercise Price (usd per share)	$ 1.82
Vested and Exercisable (shares)	218
Weighted Average Exercise Price (usd per share)	$ 1.82
Warrants | Employee | $2.00 - $2.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding (shares)	335
Weighted Average Remaining Contractual Term (in years)	1 year 6 days
Weighted Average Exercise Price (usd per share)	$ 2.58
Vested and Exercisable (shares)	335
Weighted Average Exercise Price (usd per share)	$ 2.58
Warrants | Employee | $3.00 - $3.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding (shares)	500
Weighted Average Remaining Contractual Term (in years)	2 years 3 months 17 days
Weighted Average Exercise Price (usd per share)	$ 3.59
Vested and Exercisable (shares)	500
Weighted Average Exercise Price (usd per share)	$ 3.59
Warrants | Employee | $4.00 - $4.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding (shares)	711
Weighted Average Remaining Contractual Term (in years)	6 years 9 days
Weighted Average Exercise Price (usd per share)	$ 4.38
Vested and Exercisable (shares)	619
Weighted Average Exercise Price (usd per share)	$ 4.40
Warrants | Employee | $5.00 - $5.90
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding (shares)	23
Weighted Average Remaining Contractual Term (in years)	5 years 10 months 16 days
Weighted Average Exercise Price (usd per share)	$ 5.90
Vested and Exercisable (shares)	23
Weighted Average Exercise Price (usd per share)	$ 5.90