Stockholders' Equity, Stock Options (Details) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Stock option activity, number of shares [Roll Forward]
Outstanding options, beginning of period (in shares)	1,381,843
Granted (in shares)	2,000
Exercised (in shares)	0
Forfeited (in shares)	(591,069)
Outstanding options, end of period (in shares)	792,774		1,381,843
Options vested and expected to vest (in shares)	763,992
Exercisable (in shares)	486,368
Weighted average exercise price per share [Roll Forward]
Outstanding options, beginning of period (in dollars per share)	$ 5.87
Granted (in dollars per share)	2.57
Exercised (in dollars per share)	0
Forfeited (in dollars per share)	5.23
Outstanding options, end of period (in dollars per share)	6.35		$ 5.87
Options vested and expected to vest (in dollars per share)	6.48
Exercisable (in dollars per share)	$ 8.48
Additional disclosures [Abstract]
Options outstanding, weighted average remaining contractual term	5 years 5 months 8 days		4 years 11 months 12 days
Options vested and expected to vest, weighted average remaining contractual term	5 years 2 months 19 days
Options exercisable, weighted average remaining contractual term	3 years 2 months 8 days
Options outstanding, aggregate intrinsic value	$ 0		$ 50
Options vested and expected to vest, aggregate intrinsic value	0
Options exercisable, aggregate intrinsic value	0
Options exercised in period, aggregate intrinsic value	0	$ 0
Fair value of options vested	83	$ 210
Compensation cost not yet recognized [Abstract]
Unrecognized compensation cost related to stock options	$ 300
Weighted average period of recognition for unrecognized compensation cost	2 years 6 months
Chief Financial Officer [Member]
Stock option activity, number of shares [Roll Forward]
Forfeited (in shares)	(50,000)
Compensation cost not yet recognized [Abstract]
Reversal of previously recorded stock based compensation expense	$ 58