Shareholders' Equity, Share-based Compensation (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) Plan $ / shares shares	Mar. 31, 2016 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense | $	$ 349,000	$ 84,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense | $	$ 330,000
Unrecognized compensation expense, weighted average period of recognition	1 year 11 months 12 days
Weighted-average assumptions used to value the options granted [Abstract]
Expected life in years		3 years
Risk-free interest rate		1.30%
Expected volatility		60.00%
Expected dividend yield		0.00%
Weighted-average grant date fair value (in dollars per share) | $ / shares		$ 0.49
Stock options, number of shares [Roll Forward]
Outstanding, beginning of period (in shares)	1,680,990
Options granted (in shares)	0
Options exercised (in shares)	(2,411)
Options surrendered (in shares)	(24,749)
Outstanding, end of period (in shares)	1,653,830		1,680,990
Exercisable, end of period (in shares)	788,655
Stock options, weighted average exercise price [Roll Forward]
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 3.54
Options granted (in dollars per share) | $ / shares	0
Options exercised (in dollars per share) | $ / shares	0
Options surrendered (in dollars per share) | $ / shares	9.62
Outstanding, end of period (in dollars per share) | $ / shares	3.46		$ 3.54
Exercisable, end of period (in dollars per share) | $ / shares	$ 5.91
Stock options, additional disclosures [Abstract]
Outstanding, weighted average remaining life in years	6 years 4 months 28 days		6 years 6 months 18 days
Options exercisable, Weighted average remaining life in years	3 years 7 months 17 days
Outstanding, aggregate intrinsic value | $	$ 554,695		$ 752,290
Exercisable, aggregate intrinsic value | $	16,309
Fair value of stock options vested | $	$ 2,000	$ 94,000
2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of active plans for share-based compensation grants | Plan	1
Number of shares reserved for share-based grants (in shares)	2,500,000
Shares remain available for grant (in shares)	1,401,879
Vesting period	2 years
2015 Plan [Member] | Stock Options [Member]
Stock options, number of shares [Roll Forward]
Outstanding, end of period (in shares)	1,653,830
2015 Plan [Member] | Stock Options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of share-based payment award	7 years
2015 Plan [Member] | Stock Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of share-based payment award	10 years
Vesting period	3 years