Fair Value Measurements (Summary of Valuation Techniques and Significant Unobservable Inputs) (Details) - Fair Value, Inputs, Level 3 [Member] - Recurring [Member] - Black Scholes Model [Member] - Warrant [Member] - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Stock price	$ 2.54	$ 2.54
Exercise price	$ 2.54	$ 2.54
Time to maturity (in years)	9 years 4 months 17 days	9 years 7 months 17 days
Risk-free interest rate	2.37%	2.43%
Annualized volatility	42.36%	49.08%
Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Stock price	$ 2.98	$ 2.98
Exercise price	$ 3.98	$ 3.98
Time to maturity (in years)	14 years 8 months 12 days	14 years 11 months 12 days
Risk-free interest rate	2.57%	2.62%
Annualized volatility	47.58%	108.99%