Stockholders' Equity, Stock Options (Details) - USD ($)			3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 15, 2016	Feb. 10, 2015	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Stock Options [Member]
Stock option activity, number of shares [Roll Forward]
Outstanding options, beginning of period (in shares)				3,669,469		3,669,469
Granted (in shares)						1,867,493
Exercised (in shares)						0
Forfeited (in shares)						(767,068)
Outstanding options, end of period (in shares)			4,769,894			4,769,894		3,669,469
Options vested and expected to vest (in shares)			4,530,587			4,530,587
Exercisable (in shares)			1,940,291			1,940,291
Weighted average exercise price per share [Roll Forward]
Outstanding options, beginning of period (in dollars per share)				$ 2.74		$ 2.74
Granted (in dollars per share)						0.84
Exercised (in dollars per share)						0
Forfeited (in dollars per share)						2.46
Outstanding options, end of period (in dollars per share)			$ 2.04			2.04		$ 2.74
Options vested and expected to vest (in dollars per share)			2.08			2.08
Exercisable (in dollars per share)			$ 3.04			$ 3.04
Additional disclosures [Abstract]
Options outstanding, weighted average remaining contractual term						7 years 4 months 10 days		6 years 7 months 28 days
Options vested and expected to vest, weighted average remaining contractual term						7 years 3 months 4 days
Options exercisable, weighted average remaining contractual term						4 years 9 months
Options outstanding, aggregate intrinsic value			$ 24,000			$ 24,000		$ 0
Options vested and expected to vest, aggregate intrinsic value			22,000			22,000
Options exercisable, aggregate intrinsic value			2,000			2,000
Options exercised in period, aggregate intrinsic value			0		$ 0	0	$ 0
Fair value of options vested			209,000		$ 126,000	419,000	$ 261,000
Compensation cost not yet recognized [Abstract]
Unrecognized compensation cost related to stock options			$ 1,200,000			$ 1,200,000
Weighted average period of recognition for unrecognized compensation cost						2 years 6 months 4 days
Estimated grant-date fair value (in dollars per share)			$ 0.32		$ 0.69	$ 0.32	$ 0.76
Q1 2016 Award [Member] | Market-based Stock Options [Member] | Minimum [Member]
Compensation cost not yet recognized [Abstract]
Estimated grant-date fair value (in dollars per share)				$ 0.45
Derived service period				2 years 7 months 13 days
Q1 2016 Award [Member] | Market-based Stock Options [Member] | Maximum [Member]
Compensation cost not yet recognized [Abstract]
Estimated grant-date fair value (in dollars per share)				$ 0.49
Derived service period				4 years
Q1 2016 Award [Member] | Market-based Stock Options [Member] | President and Chief Executive Officer [Member]
Stock option activity, number of shares [Roll Forward]
Granted (in shares)				150,000
Q1 2016 Award [Member] | Market-based Stock Options [Member] | Key Executives [Member]
Stock option activity, number of shares [Roll Forward]
Granted (in shares)				112,500
February 10, 2015 Award [Member] | Time-based Stock Options [Member] | Key Executives [Member]
Stock option activity, number of shares [Roll Forward]
Granted (in shares)		425,000
Compensation cost not yet recognized [Abstract]
Vesting period						3 years
June 15, 2016 Award [Member] | Time-based Stock Options [Member] | Corporate Employees [Member]
Stock option activity, number of shares [Roll Forward]
Granted (in shares)	992,000
Compensation cost not yet recognized [Abstract]
Vesting period						3 years