Shareholders' Equity - Weighted Average (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Employee Stock [Member]
Stock option disclosures
Awards reserved for issuance	134,000
Employee Stock [Member]
Black-Scholes Option-Pricing model assumptions
Expected life	1 year	1 year
Expected volatility	31.00%	37.00%
Dividend yield	0.00%	0.00%
Risk-free interest rate	0.60%	0.30%
Stock option disclosures
Exercise price, expressed as percentage of fair value on date of grant	85.00%	85.00%
Awards reserved for issuance	134,000
Restricted Stock and Restricted Stock Units [Member]
Unrecognized compensation
Total unrecognized compensation costs weighted average period of recognition	3 years 1 month 6 days
Total unrecognized compensation costs related to restricted stock units	$ 287,000
Employee Stock Option [Member]
Black-Scholes Option-Pricing model assumptions
Expected life	2 years 6 months	3 years 4 months 24 days
Expected volatility	41.00%	45.00%
Dividend yield	0.00%	0.00%
Risk-free interest rate	1.00%	1.20%
Unrecognized compensation
Total unrecognized compensation costs related to the outstanding stock options	$ 12,000
Total unrecognized compensation costs weighted average period of recognition	6 months
Stock option disclosures
Exercise price, expressed as percentage of fair value on date of grant	100.00%
Employee Stock Option [Member] | Stock Option Plan2013 [Member]
Stock option disclosures
Expiration period from date of grant	10 years
Vesting period	3 years
Awards reserved for issuance		1,100,000