Stockholders' Equity - Summary of Warrant Activity (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 $ / shares shares
Warrants Outstanding
Beginning balance (in shares) | shares	6,750	14,250
Warrants canceled/forfeited (in shares) | shares	(6,750)	(7,500)
Ending balance (in shares) | shares	0	6,750
Weighted Average Exercise Price During Period
Beginning balance (in dollars per share) | $ / shares	4.30	4.30
Warrants canceled/forfeited (in dollars per share) | $ / shares	4.30	4.30
Ending balance (in dollars per share) | $ / shares	0.00	4.30