Stock-based Compensation - Unrecognized Expense (Details)	3 Months Ended
	Mar. 31, 2017 USD ($)
Unrecognized stock-based compensation expense
Unrecognized stock compensation expense	$ 6,993
Weighted average remaining period (in years)	2 years 8 months 19 days
Employee stock options
Unrecognized stock-based compensation expense
Unrecognized stock compensation expense	$ 5,783
Weighted average remaining period (in years)	2 years 9 months 29 days
Restricted stock
Unrecognized stock-based compensation expense
Unrecognized stock compensation expense	$ 1,210
Weighted average remaining period (in years)	2 years 2 months 16 days