Stockholders' Equity - Schedule of Pre-2017 Non-Qualified Stock Options Nonvested Share Activity (Details)	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Number of Shares
Vested (in shares)	0
Pre-2017 Non-Qualified Stock Options
Number of Shares
Non-vested, beginning balance (in shares)	288,902
Vested (in shares)	(7,080)
Non-vested, ending balance (in shares)	281,822
Weighted Average Grant Date Fair Value Per Share
Non-vested, beginning balance (in dollars per share) | $ / shares	$ 7.87
Vested (in dollars per share) | $ / shares	7.58
Non-vested, ending balance (in dollars per share) | $ / shares	$ 7.88